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

Innermost 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
Argument Filtering and 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)


Strategy:

innermost




The following dependency pair can be strictly oriented:

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


The following usable rule for innermost w.r.t. to the AFS 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)=  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
Narrowing Transformation


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)


Strategy:

innermost




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

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

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

The transformation is resulting in one new DP problem:



   R
DPs
       →DP Problem 1
AFS
           →DP Problem 2
Nar
             ...
               →DP Problem 3
Argument Filtering and Ordering


Dependency Pairs:

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


Rule:


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


Strategy:

innermost




The following dependency pair can be strictly oriented:

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


The following usable rule for innermost w.r.t. to the AFS 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)=  0  
  POL(F(x1, x2))=  x1 + x2  
  POL(f(x1))=  1 + x1  

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


   R
DPs
       →DP Problem 1
AFS
           →DP Problem 2
Nar
             ...
               →DP Problem 4
Remaining Obligation(s)




The following remains to be proven:
Dependency Pair:

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


Rule:


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


Strategy:

innermost



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