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

Termination of R to be shown.



   R
Dependency Pair Analysis



R contains the following Dependency Pairs:

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

Furthermore, R contains one SCC.


   R
DPs
       →DP Problem 1
Polynomial Ordering


Dependency Pairs:

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


Rule:


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





The following dependency pair can be strictly oriented:

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


Additionally, the following usable rule w.r.t. to the implicit AFS can be oriented:

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


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

resulting in one new DP problem.



   R
DPs
       →DP Problem 1
Polo
           →DP Problem 2
Narrowing Transformation


Dependency Pair:

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


Rule:


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





On this DP problem, a Narrowing SCC transformation can be performed.
As a result of transforming the rule

F(a, f(a, x)) -> F(a, f(f(a, x), f(a, a)))
one new Dependency Pair is created:

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

The transformation is resulting in one new DP problem:



   R
DPs
       →DP Problem 1
Polo
           →DP Problem 2
Nar
             ...
               →DP Problem 3
Remaining Obligation(s)




The following remains to be proven:
Dependency Pair:

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


Rule:


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




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