YES Problem: p(s(x)) -> x fac(0()) -> s(0()) fac(s(x)) -> times(s(x),fac(p(s(x)))) Proof: DP Processor: DPs: fac#(s(x)) -> p#(s(x)) fac#(s(x)) -> fac#(p(s(x))) TRS: p(s(x)) -> x fac(0()) -> s(0()) fac(s(x)) -> times(s(x),fac(p(s(x)))) Usable Rule Processor: DPs: fac#(s(x)) -> p#(s(x)) fac#(s(x)) -> fac#(p(s(x))) TRS: p(s(x)) -> x Arctic Interpretation Processor: dimension: 1 usable rules: p(s(x)) -> x interpretation: [fac#](x0) = -8x0 + 0, [p#](x0) = -15x0 + 0, [p](x0) = -7x0 + 8, [s](x0) = 8x0 + 9 orientation: fac#(s(x)) = x + 1 >= -7x + 0 = p#(s(x)) fac#(s(x)) = x + 1 >= -7x + 0 = fac#(p(s(x))) p(s(x)) = 1x + 8 >= x = x problem: DPs: TRS: p(s(x)) -> x Qed