YES Problem: b(a(c(b(b(x1))))) -> a(c(b(b(b(a(c(x1))))))) Proof: DP Processor: DPs: b#(a(c(b(b(x1))))) -> b#(a(c(x1))) b#(a(c(b(b(x1))))) -> b#(b(a(c(x1)))) b#(a(c(b(b(x1))))) -> b#(b(b(a(c(x1))))) TRS: b(a(c(b(b(x1))))) -> a(c(b(b(b(a(c(x1))))))) Matrix Interpretation Processor: dim=4 interpretation: [b#](x0) = [0 0 1 0]x0, [0 0 0 0] [0 0 0 0] [a](x0) = [1 0 0 1]x0 [0 0 0 0] , [0 1 0 0] [0 0 0 0] [c](x0) = [0 0 0 0]x0 [0 0 1 0] , [0 1 0 0] [0] [0 0 0 1] [0] [b](x0) = [1 0 1 0]x0 + [0] [0 0 0 0] [1] orientation: b#(a(c(b(b(x1))))) = [1 1 1 0]x1 + [1] >= [0 1 1 0]x1 = b#(a(c(x1))) b#(a(c(b(b(x1))))) = [1 1 1 0]x1 + [1] >= [0 1 1 0]x1 = b#(b(a(c(x1)))) b#(a(c(b(b(x1))))) = [1 1 1 0]x1 + [1] >= [0 1 1 0]x1 = b#(b(b(a(c(x1))))) [0 0 0 0] [0] [0 0 0 0] [0] [0 0 0 0] [0] [0 0 0 0] [0] b(a(c(b(b(x1))))) = [1 1 1 0]x1 + [1] >= [0 1 1 0]x1 + [1] = a(c(b(b(b(a(c(x1))))))) [0 0 0 0] [1] [0 0 0 0] [0] problem: DPs: TRS: b(a(c(b(b(x1))))) -> a(c(b(b(b(a(c(x1))))))) Qed