YES Problem: plus(plus(X,Y),Z) -> plus(X,plus(Y,Z)) times(X,s(Y)) -> plus(X,times(Y,X)) Proof: DP Processor: DPs: plus#(plus(X,Y),Z) -> plus#(Y,Z) plus#(plus(X,Y),Z) -> plus#(X,plus(Y,Z)) times#(X,s(Y)) -> times#(Y,X) times#(X,s(Y)) -> plus#(X,times(Y,X)) TRS: plus(plus(X,Y),Z) -> plus(X,plus(Y,Z)) times(X,s(Y)) -> plus(X,times(Y,X)) EDG Processor: DPs: plus#(plus(X,Y),Z) -> plus#(Y,Z) plus#(plus(X,Y),Z) -> plus#(X,plus(Y,Z)) times#(X,s(Y)) -> times#(Y,X) times#(X,s(Y)) -> plus#(X,times(Y,X)) TRS: plus(plus(X,Y),Z) -> plus(X,plus(Y,Z)) times(X,s(Y)) -> plus(X,times(Y,X)) graph: times#(X,s(Y)) -> times#(Y,X) -> times#(X,s(Y)) -> times#(Y,X) times#(X,s(Y)) -> times#(Y,X) -> times#(X,s(Y)) -> plus#(X,times(Y,X)) times#(X,s(Y)) -> plus#(X,times(Y,X)) -> plus#(plus(X,Y),Z) -> plus#(Y,Z) times#(X,s(Y)) -> plus#(X,times(Y,X)) -> plus#(plus(X,Y),Z) -> plus#(X,plus(Y,Z)) plus#(plus(X,Y),Z) -> plus#(Y,Z) -> plus#(plus(X,Y),Z) -> plus#(Y,Z) plus#(plus(X,Y),Z) -> plus#(Y,Z) -> plus#(plus(X,Y),Z) -> plus#(X,plus(Y,Z)) plus#(plus(X,Y),Z) -> plus#(X,plus(Y,Z)) -> plus#(plus(X,Y),Z) -> plus#(Y,Z) plus#(plus(X,Y),Z) -> plus#(X,plus(Y,Z)) -> plus#(plus(X,Y),Z) -> plus#(X,plus(Y,Z)) SCC Processor: #sccs: 2 #rules: 3 #arcs: 8/16 DPs: times#(X,s(Y)) -> times#(Y,X) TRS: plus(plus(X,Y),Z) -> plus(X,plus(Y,Z)) times(X,s(Y)) -> plus(X,times(Y,X)) Matrix Interpretation Processor: dimension: 1 interpretation: [times#](x0, x1) = x0 + x1 + 1, [times](x0, x1) = 0, [s](x0) = x0 + 1, [plus](x0, x1) = 0 orientation: times#(X,s(Y)) = X + Y + 2 >= X + Y + 1 = times#(Y,X) plus(plus(X,Y),Z) = 0 >= 0 = plus(X,plus(Y,Z)) times(X,s(Y)) = 0 >= 0 = plus(X,times(Y,X)) problem: DPs: TRS: plus(plus(X,Y),Z) -> plus(X,plus(Y,Z)) times(X,s(Y)) -> plus(X,times(Y,X)) Qed DPs: plus#(plus(X,Y),Z) -> plus#(X,plus(Y,Z)) plus#(plus(X,Y),Z) -> plus#(Y,Z) TRS: plus(plus(X,Y),Z) -> plus(X,plus(Y,Z)) times(X,s(Y)) -> plus(X,times(Y,X)) Subterm Criterion Processor: simple projection: pi(plus#) = 0 problem: DPs: TRS: plus(plus(X,Y),Z) -> plus(X,plus(Y,Z)) times(X,s(Y)) -> plus(X,times(Y,X)) Qed