YES (ignored inputs)COMMENT doi:10.1007/3-540-61064-2_39 [10] Example 7 submitted by: Takahito Aoto , Junichi Yoshida , and Yoshihito Toyama Rewrite Rules: [ f(a,b) -> c, a -> a', b -> b', c -> f(a',b), c -> f(a,b'), c -> f(a,b) ] Apply Direct Methods... Inner CPs: [ f(a',b) = c, f(a,b') = c ] Outer CPs: [ f(a',b) = f(a,b'), f(a',b) = f(a,b), f(a,b') = f(a,b) ] not Overlay, check Termination... unknown/not Terminating unknown Knuth & Bendix Linear unknown Development Closed Strongly Closed Direct Methods: CR Combined result: CR 34.trs: Success(CR) (8 msec.)