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