MAYBE
(ignored inputs)COMMENT doi:10.1007/s00200-004-0148-6 [40] Example 1
Rewrite Rules:
   [ f(f(a)) -> f(f(f(a))),
     f(f(a)) -> f(a) ]
Apply Direct Methods...
Inner CPs:
   [  ]
Outer CPs:
   [ f(f(f(a))) = f(a) ]
Linear
(inner) Parallel CPs: (not computed)
unknown Toyama (Parallel CPs)
Direct Methods: Can't judge

Combined result: Can't judge
223.trs: Failure(unknown CR)
(0 msec.)