Termination w.r.t. Q of the following Term Rewriting System could be proven:

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

f(a, b) → f(a, c)
f(c, d) → f(b, d)

Q is empty.


QTRS
  ↳ AAECC Innermost

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

f(a, b) → f(a, c)
f(c, d) → f(b, d)

Q is empty.

We have applied [15,7] to switch to innermost. The TRS R 1 is none

The TRS R 2 is

f(a, b) → f(a, c)
f(c, d) → f(b, d)

The signature Sigma is {f}

↳ QTRS
  ↳ AAECC Innermost
QTRS
      ↳ DependencyPairsProof

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

f(a, b) → f(a, c)
f(c, d) → f(b, d)

The set Q consists of the following terms:

f(a, b)
f(c, d)


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(a, b) → F(a, c)
F(c, d) → F(b, d)

The TRS R consists of the following rules:

f(a, b) → f(a, c)
f(c, d) → f(b, d)

The set Q consists of the following terms:

f(a, b)
f(c, d)

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

↳ QTRS
  ↳ AAECC Innermost
    ↳ QTRS
      ↳ DependencyPairsProof
QDP
          ↳ EdgeDeletionProof

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

F(a, b) → F(a, c)
F(c, d) → F(b, d)

The TRS R consists of the following rules:

f(a, b) → f(a, c)
f(c, d) → f(b, d)

The set Q consists of the following terms:

f(a, b)
f(c, d)

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

↳ QTRS
  ↳ AAECC Innermost
    ↳ QTRS
      ↳ DependencyPairsProof
        ↳ QDP
          ↳ EdgeDeletionProof
QDP
              ↳ DependencyGraphProof

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

F(a, b) → F(a, c)
F(c, d) → F(b, d)

The TRS R consists of the following rules:

f(a, b) → f(a, c)
f(c, d) → f(b, d)

The set Q consists of the following terms:

f(a, b)
f(c, d)

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.