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

Termination of R to be shown.

R
Dependency Pair Analysis

R contains the following Dependency Pairs:

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

Furthermore, R contains one SCC.

R
DPs
→DP Problem 1
Argument Filtering and Ordering

Dependency Pairs:

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

Rule:

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

The following dependency pair can be strictly oriented:

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

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

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

Used ordering: Polynomial ordering with Polynomial interpretation:
 POL(a) =  1 POL(f) =  0

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

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

The following remains to be proven:
Dependency Pair:

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

Rule:

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

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