Termination w.r.t. Q of the following Term Rewriting System could not be shown:

Q restricted rewrite system:
The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

Q is empty.


QTRS
  ↳ Overlay + Local Confluence

Q restricted rewrite system:
The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

Q is empty.

The TRS is overlay and locally confluent. By [15] we can switch to innermost.

↳ QTRS
  ↳ Overlay + Local Confluence
QTRS
      ↳ DependencyPairsProof

Q restricted rewrite system:
The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)


Using Dependency Pairs [1,13] we result in the following initial DP problem:
Q DP problem:
The TRS P consists of the following rules:

APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(reach, x), y)
APP(app(map, f), app(app(cons, x), xs)) → APP(app(cons, app(f, x)), app(app(map, f), xs))
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(app(filter2, app(f, x)), f), x)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(or, app(app(app(app(reach, x), y), i), h))
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(app(app(filter2, app(f, x)), f), x), xs)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(reach, x)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(reach, x), y)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, x), y), i), h)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(eq, y), v)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(if_reach_2, app(app(eq, y), v)), x), y)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(if_reach_1, app(app(eq, x), u)), x)
APP(app(filter, f), app(app(cons, x), xs)) → APP(filter2, app(f, x))
APP(app(union, app(app(app(edge, x), y), i)), h) → APP(app(app(edge, x), y), app(app(union, i), h))
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(reach, x)
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(reach, x), y), i)
APP(app(eq, app(s, x)), app(s, y)) → APP(eq, x)
APP(app(eq, app(s, x)), app(s, y)) → APP(app(eq, x), y)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(if_reach_1, app(app(eq, x), u))
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(reach, v), y), app(app(union, i), h))
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, v), y), app(app(union, i), h)), empty)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(reach, v), y)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(reach, v)
APP(app(app(app(filter2, false), f), x), xs) → APP(app(filter, f), xs)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(if_reach_1, app(app(eq, x), u)), x), y)
APP(app(map, f), app(app(cons, x), xs)) → APP(cons, app(f, x))
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i))
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(eq, y)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(eq, x), u)
APP(app(app(app(filter2, true), f), x), xs) → APP(app(cons, x), app(app(filter, f), xs))
APP(app(union, app(app(app(edge, x), y), i)), h) → APP(union, i)
APP(app(map, f), app(app(cons, x), xs)) → APP(f, x)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(union, i)
APP(app(app(app(filter2, true), f), x), xs) → APP(app(filter, f), xs)
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(filter2, app(f, x)), f)
APP(app(app(app(filter2, false), f), x), xs) → APP(filter, f)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(edge, u), v), h)
APP(app(map, f), app(app(cons, x), xs)) → APP(app(map, f), xs)
APP(app(filter, f), app(app(cons, x), xs)) → APP(f, x)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(if_reach_2, app(app(eq, y), v))
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(reach, x), y), i)
APP(app(union, app(app(app(edge, x), y), i)), h) → APP(app(union, i), h)
APP(app(app(app(filter2, true), f), x), xs) → APP(filter, f)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(union, i), h)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(if_reach_2, app(app(eq, y), v)), x)
APP(app(app(app(filter2, true), f), x), xs) → APP(cons, x)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i))
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(eq, x)

The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)

We have to consider all minimal (P,Q,R)-chains.

↳ QTRS
  ↳ Overlay + Local Confluence
    ↳ QTRS
      ↳ DependencyPairsProof
QDP
          ↳ EdgeDeletionProof

Q DP problem:
The TRS P consists of the following rules:

APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(reach, x), y)
APP(app(map, f), app(app(cons, x), xs)) → APP(app(cons, app(f, x)), app(app(map, f), xs))
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(app(filter2, app(f, x)), f), x)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(or, app(app(app(app(reach, x), y), i), h))
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(app(app(filter2, app(f, x)), f), x), xs)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(reach, x)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(reach, x), y)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, x), y), i), h)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(eq, y), v)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(if_reach_2, app(app(eq, y), v)), x), y)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(if_reach_1, app(app(eq, x), u)), x)
APP(app(filter, f), app(app(cons, x), xs)) → APP(filter2, app(f, x))
APP(app(union, app(app(app(edge, x), y), i)), h) → APP(app(app(edge, x), y), app(app(union, i), h))
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(reach, x)
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(reach, x), y), i)
APP(app(eq, app(s, x)), app(s, y)) → APP(eq, x)
APP(app(eq, app(s, x)), app(s, y)) → APP(app(eq, x), y)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(if_reach_1, app(app(eq, x), u))
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(reach, v), y), app(app(union, i), h))
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, v), y), app(app(union, i), h)), empty)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(reach, v), y)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(reach, v)
APP(app(app(app(filter2, false), f), x), xs) → APP(app(filter, f), xs)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(if_reach_1, app(app(eq, x), u)), x), y)
APP(app(map, f), app(app(cons, x), xs)) → APP(cons, app(f, x))
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i))
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(eq, y)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(eq, x), u)
APP(app(app(app(filter2, true), f), x), xs) → APP(app(cons, x), app(app(filter, f), xs))
APP(app(union, app(app(app(edge, x), y), i)), h) → APP(union, i)
APP(app(map, f), app(app(cons, x), xs)) → APP(f, x)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(union, i)
APP(app(app(app(filter2, true), f), x), xs) → APP(app(filter, f), xs)
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(filter2, app(f, x)), f)
APP(app(app(app(filter2, false), f), x), xs) → APP(filter, f)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(edge, u), v), h)
APP(app(map, f), app(app(cons, x), xs)) → APP(app(map, f), xs)
APP(app(filter, f), app(app(cons, x), xs)) → APP(f, x)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(if_reach_2, app(app(eq, y), v))
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(reach, x), y), i)
APP(app(union, app(app(app(edge, x), y), i)), h) → APP(app(union, i), h)
APP(app(app(app(filter2, true), f), x), xs) → APP(filter, f)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(union, i), h)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(if_reach_2, app(app(eq, y), v)), x)
APP(app(app(app(filter2, true), f), x), xs) → APP(cons, x)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i))
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(eq, x)

The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)

We have to consider all minimal (P,Q,R)-chains.
We deleted some edges using various graph approximations

↳ QTRS
  ↳ Overlay + Local Confluence
    ↳ QTRS
      ↳ DependencyPairsProof
        ↳ QDP
          ↳ EdgeDeletionProof
QDP
              ↳ DependencyGraphProof

Q DP problem:
The TRS P consists of the following rules:

APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(reach, x), y)
APP(app(map, f), app(app(cons, x), xs)) → APP(app(cons, app(f, x)), app(app(map, f), xs))
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(app(filter2, app(f, x)), f), x)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(or, app(app(app(app(reach, x), y), i), h))
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(app(app(filter2, app(f, x)), f), x), xs)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(reach, x)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(reach, x), y)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, x), y), i), h)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(if_reach_2, app(app(eq, y), v)), x), y)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(eq, y), v)
APP(app(filter, f), app(app(cons, x), xs)) → APP(filter2, app(f, x))
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(if_reach_1, app(app(eq, x), u)), x)
APP(app(union, app(app(app(edge, x), y), i)), h) → APP(app(app(edge, x), y), app(app(union, i), h))
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(reach, x)
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(reach, x), y), i)
APP(app(eq, app(s, x)), app(s, y)) → APP(eq, x)
APP(app(eq, app(s, x)), app(s, y)) → APP(app(eq, x), y)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(if_reach_1, app(app(eq, x), u))
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(reach, v), y), app(app(union, i), h))
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(reach, v)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(reach, v), y)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, v), y), app(app(union, i), h)), empty)
APP(app(app(app(filter2, false), f), x), xs) → APP(app(filter, f), xs)
APP(app(map, f), app(app(cons, x), xs)) → APP(cons, app(f, x))
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(if_reach_1, app(app(eq, x), u)), x), y)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i))
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(eq, x), u)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(eq, y)
APP(app(app(app(filter2, true), f), x), xs) → APP(app(cons, x), app(app(filter, f), xs))
APP(app(union, app(app(app(edge, x), y), i)), h) → APP(union, i)
APP(app(map, f), app(app(cons, x), xs)) → APP(f, x)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(union, i)
APP(app(app(app(filter2, true), f), x), xs) → APP(app(filter, f), xs)
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(filter2, app(f, x)), f)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
APP(app(app(app(filter2, false), f), x), xs) → APP(filter, f)
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(edge, u), v), h)
APP(app(filter, f), app(app(cons, x), xs)) → APP(f, x)
APP(app(map, f), app(app(cons, x), xs)) → APP(app(map, f), xs)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(reach, x), y), i)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(if_reach_2, app(app(eq, y), v))
APP(app(union, app(app(app(edge, x), y), i)), h) → APP(app(union, i), h)
APP(app(app(app(filter2, true), f), x), xs) → APP(filter, f)
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(union, i), h)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(if_reach_2, app(app(eq, y), v)), x)
APP(app(app(app(filter2, true), f), x), xs) → APP(cons, x)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i))
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(eq, x)

The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)

We have to consider all minimal (P,Q,R)-chains.
The approximation of the Dependency Graph [13,14,18] contains 4 SCCs with 38 less nodes.

↳ QTRS
  ↳ Overlay + Local Confluence
    ↳ QTRS
      ↳ DependencyPairsProof
        ↳ QDP
          ↳ EdgeDeletionProof
            ↳ QDP
              ↳ DependencyGraphProof
                ↳ AND
QDP
                    ↳ QDPOrderProof
                  ↳ QDP
                  ↳ QDP
                  ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

APP(app(union, app(app(app(edge, x), y), i)), h) → APP(app(union, i), h)

The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)

We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [13]. Here, we combined the reduction pair processor with the A-transformation [14] which results in the following intermediate Q-DP Problem.
Q DP problem:
The TRS P consists of the following rules:

UNION(edge(x, y, i), h) → UNION(i, h)

R is empty.
The set Q consists of the following terms:

eq(0, 0)
eq(0, s(x0))
eq(s(x0), 0)
eq(s(x0), s(x1))
or(true, x0)
or(false, x0)
union(empty, x0)
union(edge(x0, x1, x2), x3)
reach(x0, x1, empty, x2)
reach(x0, x1, edge(x2, x3, x4), x5)
if_reach_1(true, x0, x1, edge(x2, x3, x4), x5)
if_reach_1(false, x0, x1, edge(x2, x3, x4), x5)
if_reach_2(true, x0, x1, edge(x2, x3, x4), x5)
if_reach_2(false, x0, x1, edge(x2, x3, x4), x5)
map(x0, nil)
map(x0, cons(x1, x2))
filter(x0, nil)
filter(x0, cons(x1, x2))
filter2(true, x0, x1, x2)
filter2(false, x0, x1, x2)

We have to consider all minimal (P,Q,R)-chains.


The following pairs can be oriented strictly and are deleted.


APP(app(union, app(app(app(edge, x), y), i)), h) → APP(app(union, i), h)
The remaining pairs can at least be oriented weakly.
none
Used ordering: Combined order from the following AFS and order.
UNION(x1, x2)  =  UNION(x1)
edge(x1, x2, x3)  =  edge(x3)

Recursive Path Order [2].
Precedence:
[UNION1, edge1]


The following usable rules [14] were oriented: none



↳ QTRS
  ↳ Overlay + Local Confluence
    ↳ QTRS
      ↳ DependencyPairsProof
        ↳ QDP
          ↳ EdgeDeletionProof
            ↳ QDP
              ↳ DependencyGraphProof
                ↳ AND
                  ↳ QDP
                    ↳ QDPOrderProof
QDP
                        ↳ PisEmptyProof
                  ↳ QDP
                  ↳ QDP
                  ↳ QDP

Q DP problem:
P is empty.
The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)

We have to consider all minimal (P,Q,R)-chains.
The TRS P is empty. Hence, there is no (P,Q,R) chain.

↳ QTRS
  ↳ Overlay + Local Confluence
    ↳ QTRS
      ↳ DependencyPairsProof
        ↳ QDP
          ↳ EdgeDeletionProof
            ↳ QDP
              ↳ DependencyGraphProof
                ↳ AND
                  ↳ QDP
QDP
                    ↳ QDPOrderProof
                  ↳ QDP
                  ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

APP(app(eq, app(s, x)), app(s, y)) → APP(app(eq, x), y)

The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)

We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [13]. Here, we combined the reduction pair processor with the A-transformation [14] which results in the following intermediate Q-DP Problem.
Q DP problem:
The TRS P consists of the following rules:

EQ(s(x), s(y)) → EQ(x, y)

R is empty.
The set Q consists of the following terms:

eq(0, 0)
eq(0, s(x0))
eq(s(x0), 0)
eq(s(x0), s(x1))
or(true, x0)
or(false, x0)
union(empty, x0)
union(edge(x0, x1, x2), x3)
reach(x0, x1, empty, x2)
reach(x0, x1, edge(x2, x3, x4), x5)
if_reach_1(true, x0, x1, edge(x2, x3, x4), x5)
if_reach_1(false, x0, x1, edge(x2, x3, x4), x5)
if_reach_2(true, x0, x1, edge(x2, x3, x4), x5)
if_reach_2(false, x0, x1, edge(x2, x3, x4), x5)
map(x0, nil)
map(x0, cons(x1, x2))
filter(x0, nil)
filter(x0, cons(x1, x2))
filter2(true, x0, x1, x2)
filter2(false, x0, x1, x2)

We have to consider all minimal (P,Q,R)-chains.


The following pairs can be oriented strictly and are deleted.


APP(app(eq, app(s, x)), app(s, y)) → APP(app(eq, x), y)
The remaining pairs can at least be oriented weakly.
none
Used ordering: Combined order from the following AFS and order.
EQ(x1, x2)  =  EQ(x2)
s(x1)  =  s(x1)

Recursive Path Order [2].
Precedence:
s1 > EQ1


The following usable rules [14] were oriented: none



↳ QTRS
  ↳ Overlay + Local Confluence
    ↳ QTRS
      ↳ DependencyPairsProof
        ↳ QDP
          ↳ EdgeDeletionProof
            ↳ QDP
              ↳ DependencyGraphProof
                ↳ AND
                  ↳ QDP
                  ↳ QDP
                    ↳ QDPOrderProof
QDP
                        ↳ PisEmptyProof
                  ↳ QDP
                  ↳ QDP

Q DP problem:
P is empty.
The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)

We have to consider all minimal (P,Q,R)-chains.
The TRS P is empty. Hence, there is no (P,Q,R) chain.

↳ QTRS
  ↳ Overlay + Local Confluence
    ↳ QTRS
      ↳ DependencyPairsProof
        ↳ QDP
          ↳ EdgeDeletionProof
            ↳ QDP
              ↳ DependencyGraphProof
                ↳ AND
                  ↳ QDP
                  ↳ QDP
QDP
                  ↳ QDP

Q DP problem:
The TRS P consists of the following rules:

APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, x), y), i), h)
APP(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
APP(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
APP(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(reach, v), y), app(app(union, i), h)), empty)
APP(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → APP(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)

The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)

We have to consider all minimal (P,Q,R)-chains.

↳ QTRS
  ↳ Overlay + Local Confluence
    ↳ QTRS
      ↳ DependencyPairsProof
        ↳ QDP
          ↳ EdgeDeletionProof
            ↳ QDP
              ↳ DependencyGraphProof
                ↳ AND
                  ↳ QDP
                  ↳ QDP
                  ↳ QDP
QDP
                    ↳ QDPOrderProof

Q DP problem:
The TRS P consists of the following rules:

APP(app(app(app(filter2, true), f), x), xs) → APP(app(filter, f), xs)
APP(app(map, f), app(app(cons, x), xs)) → APP(f, x)
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(app(app(filter2, app(f, x)), f), x), xs)
APP(app(app(app(filter2, false), f), x), xs) → APP(app(filter, f), xs)
APP(app(filter, f), app(app(cons, x), xs)) → APP(f, x)
APP(app(map, f), app(app(cons, x), xs)) → APP(app(map, f), xs)

The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)

We have to consider all minimal (P,Q,R)-chains.
We use the reduction pair processor [13].


The following pairs can be oriented strictly and are deleted.


APP(app(map, f), app(app(cons, x), xs)) → APP(f, x)
APP(app(filter, f), app(app(cons, x), xs)) → APP(app(app(app(filter2, app(f, x)), f), x), xs)
APP(app(filter, f), app(app(cons, x), xs)) → APP(f, x)
APP(app(map, f), app(app(cons, x), xs)) → APP(app(map, f), xs)
The remaining pairs can at least be oriented weakly.

APP(app(app(app(filter2, true), f), x), xs) → APP(app(filter, f), xs)
APP(app(app(app(filter2, false), f), x), xs) → APP(app(filter, f), xs)
Used ordering: Combined order from the following AFS and order.
APP(x1, x2)  =  APP(x2)
app(x1, x2)  =  app(x1, x2)
filter2  =  filter2
true  =  true
filter  =  filter
map  =  map
cons  =  cons
false  =  false
or  =  or
eq  =  eq
s  =  s
0  =  0
reach  =  reach
empty  =  empty
if_reach_2  =  if_reach_2
edge  =  edge
union  =  union
if_reach_1  =  if_reach_1
nil  =  nil

Recursive Path Order [2].
Precedence:
[app2, edge, ifreach1] > APP1 > [filter2, filter] > cons > [map, false, 0]
[app2, edge, ifreach1] > reach > eq > true > [map, false, 0]
[app2, edge, ifreach1] > empty > [map, false, 0]
[app2, edge, ifreach1] > ifreach2 > or > true > [map, false, 0]
[app2, edge, ifreach1] > ifreach2 > union > [map, false, 0]
s > [map, false, 0]
nil > [map, false, 0]


The following usable rules [14] were oriented: none



↳ QTRS
  ↳ Overlay + Local Confluence
    ↳ QTRS
      ↳ DependencyPairsProof
        ↳ QDP
          ↳ EdgeDeletionProof
            ↳ QDP
              ↳ DependencyGraphProof
                ↳ AND
                  ↳ QDP
                  ↳ QDP
                  ↳ QDP
                  ↳ QDP
                    ↳ QDPOrderProof
QDP
                        ↳ DependencyGraphProof

Q DP problem:
The TRS P consists of the following rules:

APP(app(app(app(filter2, true), f), x), xs) → APP(app(filter, f), xs)
APP(app(app(app(filter2, false), f), x), xs) → APP(app(filter, f), xs)

The TRS R consists of the following rules:

app(app(eq, 0), 0) → true
app(app(eq, 0), app(s, x)) → false
app(app(eq, app(s, x)), 0) → false
app(app(eq, app(s, x)), app(s, y)) → app(app(eq, x), y)
app(app(or, true), y) → true
app(app(or, false), y) → y
app(app(union, empty), h) → h
app(app(union, app(app(app(edge, x), y), i)), h) → app(app(app(edge, x), y), app(app(union, i), h))
app(app(app(app(reach, x), y), empty), h) → false
app(app(app(app(reach, x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_1, app(app(eq, x), u)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, true), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(app(if_reach_2, app(app(eq, y), v)), x), y), app(app(app(edge, u), v), i)), h)
app(app(app(app(app(if_reach_1, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(app(app(reach, x), y), i), app(app(app(edge, u), v), h))
app(app(app(app(app(if_reach_2, true), x), y), app(app(app(edge, u), v), i)), h) → true
app(app(app(app(app(if_reach_2, false), x), y), app(app(app(edge, u), v), i)), h) → app(app(or, app(app(app(app(reach, x), y), i), h)), app(app(app(app(reach, v), y), app(app(union, i), h)), empty))
app(app(map, f), nil) → nil
app(app(map, f), app(app(cons, x), xs)) → app(app(cons, app(f, x)), app(app(map, f), xs))
app(app(filter, f), nil) → nil
app(app(filter, f), app(app(cons, x), xs)) → app(app(app(app(filter2, app(f, x)), f), x), xs)
app(app(app(app(filter2, true), f), x), xs) → app(app(cons, x), app(app(filter, f), xs))
app(app(app(app(filter2, false), f), x), xs) → app(app(filter, f), xs)

The set Q consists of the following terms:

app(app(eq, 0), 0)
app(app(eq, 0), app(s, x0))
app(app(eq, app(s, x0)), 0)
app(app(eq, app(s, x0)), app(s, x1))
app(app(or, true), x0)
app(app(or, false), x0)
app(app(union, empty), x0)
app(app(union, app(app(app(edge, x0), x1), x2)), x3)
app(app(app(app(reach, x0), x1), empty), x2)
app(app(app(app(reach, x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_1, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, true), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(app(app(app(if_reach_2, false), x0), x1), app(app(app(edge, x2), x3), x4)), x5)
app(app(map, x0), nil)
app(app(map, x0), app(app(cons, x1), x2))
app(app(filter, x0), nil)
app(app(filter, x0), app(app(cons, x1), x2))
app(app(app(app(filter2, true), x0), x1), x2)
app(app(app(app(filter2, false), x0), x1), x2)

We have to consider all minimal (P,Q,R)-chains.
The approximation of the Dependency Graph [13,14,18] contains 0 SCCs with 2 less nodes.