YES (ignored inputs)COMMENT the following rules are removed from the original TRS + ( 0 ( ) , y ) -> y Rewrite Rules: [ +(s(?x),?y) -> s(+(?x,?y)), s(s(?x)) -> ?x ] Apply Direct Methods... Inner CPs: [ +(?x_1,?y) = s(+(s(?x_1),?y)), s(?x) = s(?x) ] Outer CPs: [ ] not Overlay, check Termination... Terminating, WCR Knuth & Bendix Direct Methods: CR Combined result: CR /tmp/fileBdg6oN.trs: Success(CR) (4 msec.)