YES Problem: U11(tt(),V1,V2) -> U12(isNatKind(activate(V1)),activate(V1),activate(V2)) U12(tt(),V1,V2) -> U13(isNatKind(activate(V2)),activate(V1),activate(V2)) U13(tt(),V1,V2) -> U14(isNatKind(activate(V2)),activate(V1),activate(V2)) U14(tt(),V1,V2) -> U15(isNat(activate(V1)),activate(V2)) U15(tt(),V2) -> U16(isNat(activate(V2))) U16(tt()) -> tt() U21(tt(),V1) -> U22(isNatKind(activate(V1)),activate(V1)) U22(tt(),V1) -> U23(isNat(activate(V1))) U23(tt()) -> tt() U31(tt(),V2) -> U32(isNatKind(activate(V2))) U32(tt()) -> tt() U41(tt()) -> tt() U51(tt(),N) -> U52(isNatKind(activate(N)),activate(N)) U52(tt(),N) -> activate(N) U61(tt(),M,N) -> U62(isNatKind(activate(M)),activate(M),activate(N)) U62(tt(),M,N) -> U63(isNat(activate(N)),activate(M),activate(N)) U63(tt(),M,N) -> U64(isNatKind(activate(N)),activate(M),activate(N)) U64(tt(),M,N) -> s(plus(activate(N),activate(M))) isNat(n__0()) -> tt() isNat(n__plus(V1,V2)) -> U11(isNatKind(activate(V1)),activate(V1),activate(V2)) isNat(n__s(V1)) -> U21(isNatKind(activate(V1)),activate(V1)) isNatKind(n__0()) -> tt() isNatKind(n__plus(V1,V2)) -> U31(isNatKind(activate(V1)),activate(V2)) isNatKind(n__s(V1)) -> U41(isNatKind(activate(V1))) plus(N,0()) -> U51(isNat(N),N) plus(N,s(M)) -> U61(isNat(M),M,N) 0() -> n__0() plus(X1,X2) -> n__plus(X1,X2) s(X) -> n__s(X) activate(n__0()) -> 0() activate(n__plus(X1,X2)) -> plus(activate(X1),activate(X2)) activate(n__s(X)) -> s(activate(X)) activate(X) -> X Proof: DP Processor: DPs: U11#(tt(),V1,V2) -> activate#(V2) U11#(tt(),V1,V2) -> activate#(V1) U11#(tt(),V1,V2) -> isNatKind#(activate(V1)) U11#(tt(),V1,V2) -> U12#(isNatKind(activate(V1)),activate(V1),activate(V2)) U12#(tt(),V1,V2) -> activate#(V1) U12#(tt(),V1,V2) -> activate#(V2) U12#(tt(),V1,V2) -> isNatKind#(activate(V2)) U12#(tt(),V1,V2) -> U13#(isNatKind(activate(V2)),activate(V1),activate(V2)) U13#(tt(),V1,V2) -> activate#(V1) U13#(tt(),V1,V2) -> activate#(V2) U13#(tt(),V1,V2) -> isNatKind#(activate(V2)) U13#(tt(),V1,V2) -> U14#(isNatKind(activate(V2)),activate(V1),activate(V2)) U14#(tt(),V1,V2) -> activate#(V2) U14#(tt(),V1,V2) -> activate#(V1) U14#(tt(),V1,V2) -> isNat#(activate(V1)) U14#(tt(),V1,V2) -> U15#(isNat(activate(V1)),activate(V2)) U15#(tt(),V2) -> activate#(V2) U15#(tt(),V2) -> isNat#(activate(V2)) U15#(tt(),V2) -> U16#(isNat(activate(V2))) U21#(tt(),V1) -> activate#(V1) U21#(tt(),V1) -> isNatKind#(activate(V1)) U21#(tt(),V1) -> U22#(isNatKind(activate(V1)),activate(V1)) U22#(tt(),V1) -> activate#(V1) U22#(tt(),V1) -> isNat#(activate(V1)) U22#(tt(),V1) -> U23#(isNat(activate(V1))) U31#(tt(),V2) -> activate#(V2) U31#(tt(),V2) -> isNatKind#(activate(V2)) U31#(tt(),V2) -> U32#(isNatKind(activate(V2))) U51#(tt(),N) -> activate#(N) U51#(tt(),N) -> isNatKind#(activate(N)) U51#(tt(),N) -> U52#(isNatKind(activate(N)),activate(N)) U52#(tt(),N) -> activate#(N) U61#(tt(),M,N) -> activate#(N) U61#(tt(),M,N) -> activate#(M) U61#(tt(),M,N) -> isNatKind#(activate(M)) U61#(tt(),M,N) -> U62#(isNatKind(activate(M)),activate(M),activate(N)) U62#(tt(),M,N) -> activate#(M) U62#(tt(),M,N) -> activate#(N) U62#(tt(),M,N) -> isNat#(activate(N)) U62#(tt(),M,N) -> U63#(isNat(activate(N)),activate(M),activate(N)) U63#(tt(),M,N) -> activate#(M) U63#(tt(),M,N) -> activate#(N) U63#(tt(),M,N) -> isNatKind#(activate(N)) U63#(tt(),M,N) -> U64#(isNatKind(activate(N)),activate(M),activate(N)) U64#(tt(),M,N) -> activate#(M) U64#(tt(),M,N) -> activate#(N) U64#(tt(),M,N) -> plus#(activate(N),activate(M)) U64#(tt(),M,N) -> s#(plus(activate(N),activate(M))) isNat#(n__plus(V1,V2)) -> activate#(V2) isNat#(n__plus(V1,V2)) -> activate#(V1) isNat#(n__plus(V1,V2)) -> isNatKind#(activate(V1)) isNat#(n__plus(V1,V2)) -> U11#(isNatKind(activate(V1)),activate(V1),activate(V2)) isNat#(n__s(V1)) -> activate#(V1) isNat#(n__s(V1)) -> isNatKind#(activate(V1)) isNat#(n__s(V1)) -> U21#(isNatKind(activate(V1)),activate(V1)) isNatKind#(n__plus(V1,V2)) -> activate#(V2) isNatKind#(n__plus(V1,V2)) -> activate#(V1) isNatKind#(n__plus(V1,V2)) -> isNatKind#(activate(V1)) isNatKind#(n__plus(V1,V2)) -> U31#(isNatKind(activate(V1)),activate(V2)) isNatKind#(n__s(V1)) -> activate#(V1) isNatKind#(n__s(V1)) -> isNatKind#(activate(V1)) isNatKind#(n__s(V1)) -> U41#(isNatKind(activate(V1))) plus#(N,0()) -> isNat#(N) plus#(N,0()) -> U51#(isNat(N),N) plus#(N,s(M)) -> isNat#(M) plus#(N,s(M)) -> U61#(isNat(M),M,N) activate#(n__0()) -> 0#() activate#(n__plus(X1,X2)) -> activate#(X2) activate#(n__plus(X1,X2)) -> activate#(X1) activate#(n__plus(X1,X2)) -> plus#(activate(X1),activate(X2)) activate#(n__s(X)) -> activate#(X) activate#(n__s(X)) -> s#(activate(X)) TRS: U11(tt(),V1,V2) -> U12(isNatKind(activate(V1)),activate(V1),activate(V2)) U12(tt(),V1,V2) -> U13(isNatKind(activate(V2)),activate(V1),activate(V2)) U13(tt(),V1,V2) -> U14(isNatKind(activate(V2)),activate(V1),activate(V2)) U14(tt(),V1,V2) -> U15(isNat(activate(V1)),activate(V2)) U15(tt(),V2) -> U16(isNat(activate(V2))) U16(tt()) -> tt() U21(tt(),V1) -> U22(isNatKind(activate(V1)),activate(V1)) U22(tt(),V1) -> U23(isNat(activate(V1))) U23(tt()) -> tt() U31(tt(),V2) -> U32(isNatKind(activate(V2))) U32(tt()) -> tt() U41(tt()) -> tt() U51(tt(),N) -> U52(isNatKind(activate(N)),activate(N)) U52(tt(),N) -> activate(N) U61(tt(),M,N) -> U62(isNatKind(activate(M)),activate(M),activate(N)) U62(tt(),M,N) -> U63(isNat(activate(N)),activate(M),activate(N)) U63(tt(),M,N) -> U64(isNatKind(activate(N)),activate(M),activate(N)) U64(tt(),M,N) -> s(plus(activate(N),activate(M))) isNat(n__0()) -> tt() isNat(n__plus(V1,V2)) -> U11(isNatKind(activate(V1)),activate(V1),activate(V2)) isNat(n__s(V1)) -> U21(isNatKind(activate(V1)),activate(V1)) isNatKind(n__0()) -> tt() isNatKind(n__plus(V1,V2)) -> U31(isNatKind(activate(V1)),activate(V2)) isNatKind(n__s(V1)) -> U41(isNatKind(activate(V1))) plus(N,0()) -> U51(isNat(N),N) plus(N,s(M)) -> U61(isNat(M),M,N) 0() -> n__0() plus(X1,X2) -> n__plus(X1,X2) s(X) -> n__s(X) activate(n__0()) -> 0() activate(n__plus(X1,X2)) -> plus(activate(X1),activate(X2)) activate(n__s(X)) -> s(activate(X)) activate(X) -> X Matrix Interpretation Processor: dim=1 interpretation: [0#] = 0, [s#](x0) = 1, [plus#](x0, x1) = 2x0 + 3x1, [U64#](x0, x1, x2) = 3x1 + 2x2 + 2, [U63#](x0, x1, x2) = 3x1 + 2x2 + 3, [U62#](x0, x1, x2) = 3x1 + 2x2 + 4, [U61#](x0, x1, x2) = 3x1 + 2x2 + 5, [U52#](x0, x1) = 5x0 + 2x1 + 1, [U51#](x0, x1) = 2x1 + 7, [U41#](x0) = 0, [U32#](x0) = 2, [U31#](x0, x1) = x0 + 2x1 + 6, [U23#](x0) = 0, [U22#](x0, x1) = 2x1 + 1, [U21#](x0, x1) = 2x1 + 3, [U16#](x0) = 0, [U15#](x0, x1) = 2x1 + 1, [isNat#](x0) = 2x0, [U14#](x0, x1, x2) = 2x1 + 3x2 + 2, [U13#](x0, x1, x2) = 2x1 + 3x2 + 3, [U12#](x0, x1, x2) = 2x1 + 4x2 + 4, [isNatKind#](x0) = 2x0 + 2, [activate#](x0) = x0, [U11#](x0, x1, x2) = 4x1 + 4x2 + 5, [0] = 4, [n__s](x0) = x0 + 2, [n__plus](x0, x1) = 2x0 + 4x1 + 3, [n__0] = 4, [s](x0) = x0 + 2, [plus](x0, x1) = 2x0 + 4x1 + 3, [U64](x0, x1, x2) = 4x1 + 2x2 + 6, [U63](x0, x1, x2) = 4x1 + 2x2 + 6, [U62](x0, x1, x2) = 4x1 + 2x2 + 6, [U61](x0, x1, x2) = 4x1 + 2x2 + 6, [U52](x0, x1) = x1 + 1, [U51](x0, x1) = 2x1 + 1, [U41](x0) = 1, [U32](x0) = x0, [U31](x0, x1) = 1, [U23](x0) = 0, [U22](x0, x1) = 3, [U21](x0, x1) = x0 + 2x1 + 3, [U16](x0) = 2, [U15](x0, x1) = 2, [isNat](x0) = 4x0, [U14](x0, x1, x2) = 3x1 + 2, [U13](x0, x1, x2) = 2x0 + 3x1 + 3, [U12](x0, x1, x2) = 2x0 + 4x1 + 5, [isNatKind](x0) = 1, [activate](x0) = x0, [U11](x0, x1, x2) = 7x1 + 7, [tt] = 0 orientation: U11#(tt(),V1,V2) = 4V1 + 4V2 + 5 >= V2 = activate#(V2) U11#(tt(),V1,V2) = 4V1 + 4V2 + 5 >= V1 = activate#(V1) U11#(tt(),V1,V2) = 4V1 + 4V2 + 5 >= 2V1 + 2 = isNatKind#(activate(V1)) U11#(tt(),V1,V2) = 4V1 + 4V2 + 5 >= 2V1 + 4V2 + 4 = U12#(isNatKind(activate(V1)),activate(V1),activate(V2)) U12#(tt(),V1,V2) = 2V1 + 4V2 + 4 >= V1 = activate#(V1) U12#(tt(),V1,V2) = 2V1 + 4V2 + 4 >= V2 = activate#(V2) U12#(tt(),V1,V2) = 2V1 + 4V2 + 4 >= 2V2 + 2 = isNatKind#(activate(V2)) U12#(tt(),V1,V2) = 2V1 + 4V2 + 4 >= 2V1 + 3V2 + 3 = U13#(isNatKind(activate(V2)),activate(V1),activate(V2)) U13#(tt(),V1,V2) = 2V1 + 3V2 + 3 >= V1 = activate#(V1) U13#(tt(),V1,V2) = 2V1 + 3V2 + 3 >= V2 = activate#(V2) U13#(tt(),V1,V2) = 2V1 + 3V2 + 3 >= 2V2 + 2 = isNatKind#(activate(V2)) U13#(tt(),V1,V2) = 2V1 + 3V2 + 3 >= 2V1 + 3V2 + 2 = U14#(isNatKind(activate(V2)),activate(V1),activate(V2)) U14#(tt(),V1,V2) = 2V1 + 3V2 + 2 >= V2 = activate#(V2) U14#(tt(),V1,V2) = 2V1 + 3V2 + 2 >= V1 = activate#(V1) U14#(tt(),V1,V2) = 2V1 + 3V2 + 2 >= 2V1 = isNat#(activate(V1)) U14#(tt(),V1,V2) = 2V1 + 3V2 + 2 >= 2V2 + 1 = U15#(isNat(activate(V1)),activate(V2)) U15#(tt(),V2) = 2V2 + 1 >= V2 = activate#(V2) U15#(tt(),V2) = 2V2 + 1 >= 2V2 = isNat#(activate(V2)) U15#(tt(),V2) = 2V2 + 1 >= 0 = U16#(isNat(activate(V2))) U21#(tt(),V1) = 2V1 + 3 >= V1 = activate#(V1) U21#(tt(),V1) = 2V1 + 3 >= 2V1 + 2 = isNatKind#(activate(V1)) U21#(tt(),V1) = 2V1 + 3 >= 2V1 + 1 = U22#(isNatKind(activate(V1)),activate(V1)) U22#(tt(),V1) = 2V1 + 1 >= V1 = activate#(V1) U22#(tt(),V1) = 2V1 + 1 >= 2V1 = isNat#(activate(V1)) U22#(tt(),V1) = 2V1 + 1 >= 0 = U23#(isNat(activate(V1))) U31#(tt(),V2) = 2V2 + 6 >= V2 = activate#(V2) U31#(tt(),V2) = 2V2 + 6 >= 2V2 + 2 = isNatKind#(activate(V2)) U31#(tt(),V2) = 2V2 + 6 >= 2 = U32#(isNatKind(activate(V2))) U51#(tt(),N) = 2N + 7 >= N = activate#(N) U51#(tt(),N) = 2N + 7 >= 2N + 2 = isNatKind#(activate(N)) U51#(tt(),N) = 2N + 7 >= 2N + 6 = U52#(isNatKind(activate(N)),activate(N)) U52#(tt(),N) = 2N + 1 >= N = activate#(N) U61#(tt(),M,N) = 3M + 2N + 5 >= N = activate#(N) U61#(tt(),M,N) = 3M + 2N + 5 >= M = activate#(M) U61#(tt(),M,N) = 3M + 2N + 5 >= 2M + 2 = isNatKind#(activate(M)) U61#(tt(),M,N) = 3M + 2N + 5 >= 3M + 2N + 4 = U62#(isNatKind(activate(M)),activate(M),activate(N)) U62#(tt(),M,N) = 3M + 2N + 4 >= M = activate#(M) U62#(tt(),M,N) = 3M + 2N + 4 >= N = activate#(N) U62#(tt(),M,N) = 3M + 2N + 4 >= 2N = isNat#(activate(N)) U62#(tt(),M,N) = 3M + 2N + 4 >= 3M + 2N + 3 = U63#(isNat(activate(N)),activate(M),activate(N)) U63#(tt(),M,N) = 3M + 2N + 3 >= M = activate#(M) U63#(tt(),M,N) = 3M + 2N + 3 >= N = activate#(N) U63#(tt(),M,N) = 3M + 2N + 3 >= 2N + 2 = isNatKind#(activate(N)) U63#(tt(),M,N) = 3M + 2N + 3 >= 3M + 2N + 2 = U64#(isNatKind(activate(N)),activate(M),activate(N)) U64#(tt(),M,N) = 3M + 2N + 2 >= M = activate#(M) U64#(tt(),M,N) = 3M + 2N + 2 >= N = activate#(N) U64#(tt(),M,N) = 3M + 2N + 2 >= 3M + 2N = plus#(activate(N),activate(M)) U64#(tt(),M,N) = 3M + 2N + 2 >= 1 = s#(plus(activate(N),activate(M))) isNat#(n__plus(V1,V2)) = 4V1 + 8V2 + 6 >= V2 = activate#(V2) isNat#(n__plus(V1,V2)) = 4V1 + 8V2 + 6 >= V1 = activate#(V1) isNat#(n__plus(V1,V2)) = 4V1 + 8V2 + 6 >= 2V1 + 2 = isNatKind#(activate(V1)) isNat#(n__plus(V1,V2)) = 4V1 + 8V2 + 6 >= 4V1 + 4V2 + 5 = U11#(isNatKind(activate(V1)),activate(V1),activate(V2)) isNat#(n__s(V1)) = 2V1 + 4 >= V1 = activate#(V1) isNat#(n__s(V1)) = 2V1 + 4 >= 2V1 + 2 = isNatKind#(activate(V1)) isNat#(n__s(V1)) = 2V1 + 4 >= 2V1 + 3 = U21#(isNatKind(activate(V1)),activate(V1)) isNatKind#(n__plus(V1,V2)) = 4V1 + 8V2 + 8 >= V2 = activate#(V2) isNatKind#(n__plus(V1,V2)) = 4V1 + 8V2 + 8 >= V1 = activate#(V1) isNatKind#(n__plus(V1,V2)) = 4V1 + 8V2 + 8 >= 2V1 + 2 = isNatKind#(activate(V1)) isNatKind#(n__plus(V1,V2)) = 4V1 + 8V2 + 8 >= 2V2 + 7 = U31#(isNatKind(activate(V1)),activate(V2)) isNatKind#(n__s(V1)) = 2V1 + 6 >= V1 = activate#(V1) isNatKind#(n__s(V1)) = 2V1 + 6 >= 2V1 + 2 = isNatKind#(activate(V1)) isNatKind#(n__s(V1)) = 2V1 + 6 >= 0 = U41#(isNatKind(activate(V1))) plus#(N,0()) = 2N + 12 >= 2N = isNat#(N) plus#(N,0()) = 2N + 12 >= 2N + 7 = U51#(isNat(N),N) plus#(N,s(M)) = 3M + 2N + 6 >= 2M = isNat#(M) plus#(N,s(M)) = 3M + 2N + 6 >= 3M + 2N + 5 = U61#(isNat(M),M,N) activate#(n__0()) = 4 >= 0 = 0#() activate#(n__plus(X1,X2)) = 2X1 + 4X2 + 3 >= X2 = activate#(X2) activate#(n__plus(X1,X2)) = 2X1 + 4X2 + 3 >= X1 = activate#(X1) activate#(n__plus(X1,X2)) = 2X1 + 4X2 + 3 >= 2X1 + 3X2 = plus#(activate(X1),activate(X2)) activate#(n__s(X)) = X + 2 >= X = activate#(X) activate#(n__s(X)) = X + 2 >= 1 = s#(activate(X)) U11(tt(),V1,V2) = 7V1 + 7 >= 4V1 + 7 = U12(isNatKind(activate(V1)),activate(V1),activate(V2)) U12(tt(),V1,V2) = 4V1 + 5 >= 3V1 + 5 = U13(isNatKind(activate(V2)),activate(V1),activate(V2)) U13(tt(),V1,V2) = 3V1 + 3 >= 3V1 + 2 = U14(isNatKind(activate(V2)),activate(V1),activate(V2)) U14(tt(),V1,V2) = 3V1 + 2 >= 2 = U15(isNat(activate(V1)),activate(V2)) U15(tt(),V2) = 2 >= 2 = U16(isNat(activate(V2))) U16(tt()) = 2 >= 0 = tt() U21(tt(),V1) = 2V1 + 3 >= 3 = U22(isNatKind(activate(V1)),activate(V1)) U22(tt(),V1) = 3 >= 0 = U23(isNat(activate(V1))) U23(tt()) = 0 >= 0 = tt() U31(tt(),V2) = 1 >= 1 = U32(isNatKind(activate(V2))) U32(tt()) = 0 >= 0 = tt() U41(tt()) = 1 >= 0 = tt() U51(tt(),N) = 2N + 1 >= N + 1 = U52(isNatKind(activate(N)),activate(N)) U52(tt(),N) = N + 1 >= N = activate(N) U61(tt(),M,N) = 4M + 2N + 6 >= 4M + 2N + 6 = U62(isNatKind(activate(M)),activate(M),activate(N)) U62(tt(),M,N) = 4M + 2N + 6 >= 4M + 2N + 6 = U63(isNat(activate(N)),activate(M),activate(N)) U63(tt(),M,N) = 4M + 2N + 6 >= 4M + 2N + 6 = U64(isNatKind(activate(N)),activate(M),activate(N)) U64(tt(),M,N) = 4M + 2N + 6 >= 4M + 2N + 5 = s(plus(activate(N),activate(M))) isNat(n__0()) = 16 >= 0 = tt() isNat(n__plus(V1,V2)) = 8V1 + 16V2 + 12 >= 7V1 + 7 = U11(isNatKind(activate(V1)),activate(V1),activate(V2)) isNat(n__s(V1)) = 4V1 + 8 >= 2V1 + 4 = U21(isNatKind(activate(V1)),activate(V1)) isNatKind(n__0()) = 1 >= 0 = tt() isNatKind(n__plus(V1,V2)) = 1 >= 1 = U31(isNatKind(activate(V1)),activate(V2)) isNatKind(n__s(V1)) = 1 >= 1 = U41(isNatKind(activate(V1))) plus(N,0()) = 2N + 19 >= 2N + 1 = U51(isNat(N),N) plus(N,s(M)) = 4M + 2N + 11 >= 4M + 2N + 6 = U61(isNat(M),M,N) 0() = 4 >= 4 = n__0() plus(X1,X2) = 2X1 + 4X2 + 3 >= 2X1 + 4X2 + 3 = n__plus(X1,X2) s(X) = X + 2 >= X + 2 = n__s(X) activate(n__0()) = 4 >= 4 = 0() activate(n__plus(X1,X2)) = 2X1 + 4X2 + 3 >= 2X1 + 4X2 + 3 = plus(activate(X1),activate(X2)) activate(n__s(X)) = X + 2 >= X + 2 = s(activate(X)) activate(X) = X >= X = X problem: DPs: TRS: U11(tt(),V1,V2) -> U12(isNatKind(activate(V1)),activate(V1),activate(V2)) U12(tt(),V1,V2) -> U13(isNatKind(activate(V2)),activate(V1),activate(V2)) U13(tt(),V1,V2) -> U14(isNatKind(activate(V2)),activate(V1),activate(V2)) U14(tt(),V1,V2) -> U15(isNat(activate(V1)),activate(V2)) U15(tt(),V2) -> U16(isNat(activate(V2))) U16(tt()) -> tt() U21(tt(),V1) -> U22(isNatKind(activate(V1)),activate(V1)) U22(tt(),V1) -> U23(isNat(activate(V1))) U23(tt()) -> tt() U31(tt(),V2) -> U32(isNatKind(activate(V2))) U32(tt()) -> tt() U41(tt()) -> tt() U51(tt(),N) -> U52(isNatKind(activate(N)),activate(N)) U52(tt(),N) -> activate(N) U61(tt(),M,N) -> U62(isNatKind(activate(M)),activate(M),activate(N)) U62(tt(),M,N) -> U63(isNat(activate(N)),activate(M),activate(N)) U63(tt(),M,N) -> U64(isNatKind(activate(N)),activate(M),activate(N)) U64(tt(),M,N) -> s(plus(activate(N),activate(M))) isNat(n__0()) -> tt() isNat(n__plus(V1,V2)) -> U11(isNatKind(activate(V1)),activate(V1),activate(V2)) isNat(n__s(V1)) -> U21(isNatKind(activate(V1)),activate(V1)) isNatKind(n__0()) -> tt() isNatKind(n__plus(V1,V2)) -> U31(isNatKind(activate(V1)),activate(V2)) isNatKind(n__s(V1)) -> U41(isNatKind(activate(V1))) plus(N,0()) -> U51(isNat(N),N) plus(N,s(M)) -> U61(isNat(M),M,N) 0() -> n__0() plus(X1,X2) -> n__plus(X1,X2) s(X) -> n__s(X) activate(n__0()) -> 0() activate(n__plus(X1,X2)) -> plus(activate(X1),activate(X2)) activate(n__s(X)) -> s(activate(X)) activate(X) -> X Qed