YES 1 decompositions #0 ----------- 1: +(x,0()) -> x 2: +(x,s(y)) -> s(+(x,y)) 3: +(0(),y) -> y 4: +(s(x),y) -> s(+(x,y)) 5: *(x,0()) -> 0() 6: *(x,s(y)) -> +(*(x,y),x) 7: *(0(),y) -> 0() 8: *(s(x),y) -> +(*(x,y),y) 9: +(+(x,y),z) -> +(x,+(y,z)) 10: +(x,y) -> +(y,x) @Jouannaud and Kirchner's criterion --- R 1: +(x,0()) -> x 2: +(x,s(y)) -> s(+(x,y)) 3: +(0(),y) -> y 4: +(s(x),y) -> s(+(x,y)) 5: *(x,0()) -> 0() 6: *(x,s(y)) -> +(*(x,y),x) 7: *(0(),y) -> 0() 8: *(s(x),y) -> +(*(x,y),y) 9: +(+(x,y),z) -> +(x,+(y,z)) 10: +(x,y) -> +(y,x) --- S 1: +(x,0()) -> x 2: +(x,s(y)) -> s(+(x,y)) 3: +(0(),y) -> y 4: +(s(x),y) -> s(+(x,y)) 5: *(x,0()) -> 0() 6: *(x,s(y)) -> +(*(x,y),x) 7: *(0(),y) -> 0() 8: *(s(x),y) -> +(*(x,y),y) 9: +(+(x,y),z) -> +(x,+(y,z)) 10: +(x,y) -> +(y,x)