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

Furthermore, R contains one SCC.


   R
DPs
       →DP Problem 1
Polynomial Ordering


Dependency Pairs:

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


Rule:


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





The following dependency pair can be strictly oriented:

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


Additionally, the following usable rule using the Ce-refinement can be oriented:

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


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

resulting in one new DP problem.



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




The following remains to be proven:
Dependency Pairs:

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


Rule:


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




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