YES 1 decompositions #0 ----------- 1: +(x,0()) -> x 2: +(x,s(y)) -> s(+(x,y)) 3: *(x,0()) -> 0() 4: *(x,s(y)) -> +(*(x,y),x) 5: +(+(x,y),z) -> +(x,+(y,z)) 6: +(x,y) -> +(y,x) 7: *(*(x,y),z) -> *(x,*(y,z)) 8: *(x,y) -> *(y,x) 9: *(x,+(y,z)) -> +(*(x,y),*(x,z)) @Jouannaud and Kirchner's criterion --- R 1: +(x,0()) -> x 2: +(x,s(y)) -> s(+(x,y)) 3: *(x,0()) -> 0() 4: *(x,s(y)) -> +(*(x,y),x) 5: +(+(x,y),z) -> +(x,+(y,z)) 6: +(x,y) -> +(y,x) 7: *(*(x,y),z) -> *(x,*(y,z)) 8: *(x,y) -> *(y,x) 9: *(x,+(y,z)) -> +(*(x,y),*(x,z)) --- S 1: +(x,0()) -> x 2: +(x,s(y)) -> s(+(x,y)) 3: *(x,0()) -> 0() 4: *(x,s(y)) -> +(*(x,y),x) 5: +(+(x,y),z) -> +(x,+(y,z)) 6: +(x,y) -> +(y,x) 7: *(*(x,y),z) -> *(x,*(y,z)) 8: *(x,y) -> *(y,x) 9: *(x,+(y,z)) -> +(*(x,y),*(x,z))