YES (ignored inputs)COMMENT Example 3 of DOI:10.1007/s00200-004-0148-6 Rewrite Rules: [ -(+(x,-(x))) -> 0, +(x,-(x)) -> 0, 0 -> -(0) ] Apply Direct Methods... Inner CPs: [ -(0) = 0 ] Outer CPs: [ ] not Overlay, check Termination... unknown/not Terminating unknown Knuth & Bendix Linear unknown Development Closed Strongly Closed Direct Methods: CR Final result: CR 224.trs: Success(CR) (0 msec.)