YES Problem: +(*(x,y),*(x,z)) -> *(x,+(y,z)) +(+(x,y),z) -> +(x,+(y,z)) +(*(x,y),+(*(x,z),u())) -> +(*(x,+(y,z)),u()) Proof: Bounds Processor: bound: 0 enrichment: match automaton: final states: {12,11,10,5,4,1} transitions: f30() -> 2* *0(2,12) -> 10* *0(2,3) -> 10*,3,4,1 *0(2,11) -> 10* *0(2,10) -> 10* +0(2,12) -> 12* +0(1,6) -> 11*,4,3,5 +0(2,3) -> 12*,3,4 +0(2,11) -> 12* +0(10,6) -> 11* +0(2,2) -> 3* +0(2,10) -> 12* u0() -> 6* 1 -> 4,3 4 -> 3* 5 -> 4* problem: Qed