YES Problem: p(a(x0),p(b(a(x1)),x2)) -> p(x1,p(a(b(a(x1))),x2)) a(b(a(x0))) -> b(a(b(x0))) Proof: DP Processor: DPs: p#(a(x0),p(b(a(x1)),x2)) -> a#(b(a(x1))) p#(a(x0),p(b(a(x1)),x2)) -> p#(a(b(a(x1))),x2) p#(a(x0),p(b(a(x1)),x2)) -> p#(x1,p(a(b(a(x1))),x2)) a#(b(a(x0))) -> a#(b(x0)) TRS: p(a(x0),p(b(a(x1)),x2)) -> p(x1,p(a(b(a(x1))),x2)) a(b(a(x0))) -> b(a(b(x0))) Matrix Interpretation Processor: dim=3 usable rules: p(a(x0),p(b(a(x1)),x2)) -> p(x1,p(a(b(a(x1))),x2)) a(b(a(x0))) -> b(a(b(x0))) interpretation: [a#](x0) = [0 1 0]x0 + [1], [p#](x0, x1) = [0 1 0]x0 + [0 1 0]x1 + [1], [0 0 0] [0 0 0] [p](x0, x1) = [0 1 0]x0 + [0 1 0]x1 [0 0 0] [0 0 0] , [1 0 0] [b](x0) = [0 0 1]x0 [0 0 0] , [0 0 1] [0] [a](x0) = [1 0 0]x0 + [1] [0 1 1] [1] orientation: p#(a(x0),p(b(a(x1)),x2)) = [1 0 0]x0 + [0 1 1]x1 + [0 1 0]x2 + [3] >= [0 1 1]x1 + [2] = a#(b(a(x1))) p#(a(x0),p(b(a(x1)),x2)) = [1 0 0]x0 + [0 1 1]x1 + [0 1 0]x2 + [3] >= [0 0 1]x1 + [0 1 0]x2 + [2] = p#(a(b(a(x1))),x2) p#(a(x0),p(b(a(x1)),x2)) = [1 0 0]x0 + [0 1 1]x1 + [0 1 0]x2 + [3] >= [0 1 1]x1 + [0 1 0]x2 + [2] = p#(x1,p(a(b(a(x1))),x2)) a#(b(a(x0))) = [0 1 1]x0 + [2] >= [0 0 1]x0 + [1] = a#(b(x0)) [0 0 0] [0 0 0] [0 0 0] [0] [0 0 0] [0 0 0] [0] p(a(x0),p(b(a(x1)),x2)) = [1 0 0]x0 + [0 1 1]x1 + [0 1 0]x2 + [2] >= [0 1 1]x1 + [0 1 0]x2 + [1] = p(x1,p(a(b(a(x1))),x2)) [0 0 0] [0 0 0] [0 0 0] [0] [0 0 0] [0 0 0] [0] [0 0 0] [0] [0 0 0] [0] a(b(a(x0))) = [0 0 1]x0 + [1] >= [0 0 1]x0 + [1] = b(a(b(x0))) [0 1 1] [2] [0 0 0] [0] problem: DPs: TRS: p(a(x0),p(b(a(x1)),x2)) -> p(x1,p(a(b(a(x1))),x2)) a(b(a(x0))) -> b(a(b(x0))) Qed