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:

f(f(a, x), y) → f(f(x, f(a, y)), a)

Q is empty.


↳ QTRS
  ↳ Overlay + Local Confluence

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

f(f(a, x), y) → f(f(x, f(a, y)), a)

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:

f(f(a, x), y) → f(f(x, f(a, y)), a)

The set Q consists of the following terms:

f(f(a, x0), x1)


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

F(f(a, x), y) → F(x, f(a, y))
F(f(a, x), y) → F(f(x, f(a, y)), a)
F(f(a, x), y) → F(a, y)

The TRS R consists of the following rules:

f(f(a, x), y) → f(f(x, f(a, y)), a)

The set Q consists of the following terms:

f(f(a, x0), x1)

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:

F(f(a, x), y) → F(x, f(a, y))
F(f(a, x), y) → F(f(x, f(a, y)), a)
F(f(a, x), y) → F(a, y)

The TRS R consists of the following rules:

f(f(a, x), y) → f(f(x, f(a, y)), a)

The set Q consists of the following terms:

f(f(a, x0), x1)

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:

F(f(a, x), y) → F(x, f(a, y))
F(f(a, x), y) → F(f(x, f(a, y)), a)
F(f(a, x), y) → F(a, y)

The TRS R consists of the following rules:

f(f(a, x), y) → f(f(x, f(a, y)), a)

The set Q consists of the following terms:

f(f(a, x0), x1)

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

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

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

F(f(a, x), y) → F(x, f(a, y))
F(f(a, x), y) → F(f(x, f(a, y)), a)

The TRS R consists of the following rules:

f(f(a, x), y) → f(f(x, f(a, y)), a)

The set Q consists of the following terms:

f(f(a, x0), x1)

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