Term Rewriting System R:
[x]
f(x, f(f(a, a), a)) -> f(f(a, f(a, a)), x)

Termination of R to be shown.

`   R`
`     ↳Dependency Pair Analysis`

R contains the following Dependency Pairs:

F(x, f(f(a, a), a)) -> F(f(a, f(a, a)), x)
F(x, f(f(a, a), a)) -> F(a, f(a, a))

Furthermore, R contains one SCC.

`   R`
`     ↳DPs`
`       →DP Problem 1`
`         ↳Argument Filtering and Ordering`

Dependency Pairs:

F(x, f(f(a, a), a)) -> F(a, f(a, a))
F(x, f(f(a, a), a)) -> F(f(a, f(a, a)), x)

Rule:

f(x, f(f(a, a), a)) -> f(f(a, f(a, a)), x)

The following dependency pair can be strictly oriented:

F(x, f(f(a, a), a)) -> F(a, f(a, a))

The following usable rule w.r.t. to the AFS can be oriented:

f(x, f(f(a, a), a)) -> f(f(a, f(a, a)), x)

Used ordering: Polynomial ordering with Polynomial interpretation:
 POL(a) =  0 POL(F(x1, x2)) =  x1 + x2 POL(f(x1, x2)) =  1 + x1 + x2

resulting in one new DP problem.
Used Argument Filtering System:
F(x1, x2) -> F(x1, x2)
f(x1, x2) -> f(x1, x2)

`   R`
`     ↳DPs`
`       →DP Problem 1`
`         ↳AFS`
`           →DP Problem 2`
`             ↳Remaining Obligation(s)`

The following remains to be proven:
Dependency Pair:

F(x, f(f(a, a), a)) -> F(f(a, f(a, a)), x)

Rule:

f(x, f(f(a, a), a)) -> f(f(a, f(a, a)), x)

Termination of R could not be shown.
Duration:
0:00 minutes