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:

a1(a1(f2(b, a1(x)))) -> f2(a1(a1(a1(x))), b)
a1(a1(x)) -> f2(b, a1(f2(a1(x), b)))
f2(a1(x), b) -> f2(b, a1(x))

Q is empty.


↳ QTRS
  ↳ DependencyPairsProof

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

a1(a1(f2(b, a1(x)))) -> f2(a1(a1(a1(x))), b)
a1(a1(x)) -> f2(b, a1(f2(a1(x), b)))
f2(a1(x), b) -> f2(b, a1(x))

Q is empty.

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

A1(a1(f2(b, a1(x)))) -> A1(a1(x))
A1(a1(x)) -> F2(a1(x), b)
A1(a1(x)) -> A1(f2(a1(x), b))
A1(a1(x)) -> F2(b, a1(f2(a1(x), b)))
A1(a1(f2(b, a1(x)))) -> A1(a1(a1(x)))
A1(a1(f2(b, a1(x)))) -> F2(a1(a1(a1(x))), b)
F2(a1(x), b) -> F2(b, a1(x))

The TRS R consists of the following rules:

a1(a1(f2(b, a1(x)))) -> f2(a1(a1(a1(x))), b)
a1(a1(x)) -> f2(b, a1(f2(a1(x), b)))
f2(a1(x), b) -> f2(b, a1(x))

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

↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof

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

A1(a1(f2(b, a1(x)))) -> A1(a1(x))
A1(a1(x)) -> F2(a1(x), b)
A1(a1(x)) -> A1(f2(a1(x), b))
A1(a1(x)) -> F2(b, a1(f2(a1(x), b)))
A1(a1(f2(b, a1(x)))) -> A1(a1(a1(x)))
A1(a1(f2(b, a1(x)))) -> F2(a1(a1(a1(x))), b)
F2(a1(x), b) -> F2(b, a1(x))

The TRS R consists of the following rules:

a1(a1(f2(b, a1(x)))) -> f2(a1(a1(a1(x))), b)
a1(a1(x)) -> f2(b, a1(f2(a1(x), b)))
f2(a1(x), b) -> f2(b, a1(x))

Q is empty.
We have to consider all minimal (P,Q,R)-chains.
The approximation of the Dependency Graph [13,14,18] contains 1 SCC with 5 less nodes.

↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ QDP
          ↳ QDPOrderProof

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

A1(a1(f2(b, a1(x)))) -> A1(a1(x))
A1(a1(f2(b, a1(x)))) -> A1(a1(a1(x)))

The TRS R consists of the following rules:

a1(a1(f2(b, a1(x)))) -> f2(a1(a1(a1(x))), b)
a1(a1(x)) -> f2(b, a1(f2(a1(x), b)))
f2(a1(x), b) -> f2(b, a1(x))

Q is empty.
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.


A1(a1(f2(b, a1(x)))) -> A1(a1(x))
The remaining pairs can at least be oriented weakly.

A1(a1(f2(b, a1(x)))) -> A1(a1(a1(x)))
Used ordering: Polynomial Order [17,21] with Interpretation:

POL( b ) = 2


POL( a1(x1) ) = 2x1 + 2


POL( f2(x1, x2) ) = max{0, x1 + x2 - 2}


POL( A1(x1) ) = max{0, 2x1 - 2}



The following usable rules [14] were oriented:

a1(a1(f2(b, a1(x)))) -> f2(a1(a1(a1(x))), b)
f2(a1(x), b) -> f2(b, a1(x))
a1(a1(x)) -> f2(b, a1(f2(a1(x), b)))



↳ QTRS
  ↳ DependencyPairsProof
    ↳ QDP
      ↳ DependencyGraphProof
        ↳ QDP
          ↳ QDPOrderProof
            ↳ QDP

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

A1(a1(f2(b, a1(x)))) -> A1(a1(a1(x)))

The TRS R consists of the following rules:

a1(a1(f2(b, a1(x)))) -> f2(a1(a1(a1(x))), b)
a1(a1(x)) -> f2(b, a1(f2(a1(x), b)))
f2(a1(x), b) -> f2(b, a1(x))

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