YES Problem: h(x,c(y,z)) -> h(c(s(y),x),z) h(c(s(x),c(s(0()),y)),z) -> h(y,c(s(0()),c(x,z))) Proof: DP Processor: DPs: h#(x,c(y,z)) -> h#(c(s(y),x),z) h#(c(s(x),c(s(0()),y)),z) -> h#(y,c(s(0()),c(x,z))) TRS: h(x,c(y,z)) -> h(c(s(y),x),z) h(c(s(x),c(s(0()),y)),z) -> h(y,c(s(0()),c(x,z))) Matrix Interpretation Processor: dim=2 interpretation: [h#](x0, x1) = [0 1]x0 + [1 0]x1, [0] [0] = [2], [0 2] [s](x0) = [0 0]x0, [0 0] [0 0] [1] [h](x0, x1) = [0 1]x0 + [1 0]x1 + [0], [0 2] [1] [c](x0, x1) = [1 0]x0 + x1 + [0] orientation: h#(x,c(y,z)) = [0 1]x + [0 2]y + [1 0]z + [1] >= [0 1]x + [0 2]y + [1 0]z = h#(c(s(y),x),z) h#(c(s(x),c(s(0()),y)),z) = [0 2]x + [0 1]y + [1 0]z + [4] >= [0 2]x + [0 1]y + [1 0]z + [2] = h#(y,c(s(0()),c(x,z))) [0 0] [0 0] [0 0] [1] [0 0] [0 0] [0 0] [1] h(x,c(y,z)) = [0 1]x + [0 2]y + [1 0]z + [1] >= [0 1]x + [0 2]y + [1 0]z + [0] = h(c(s(y),x),z) [0 0] [0 0] [0 0] [1] [0 0] [0 0] [0 0] [1] h(c(s(x),c(s(0()),y)),z) = [0 2]x + [0 1]y + [1 0]z + [4] >= [0 2]x + [0 1]y + [1 0]z + [2] = h(y,c(s(0()),c(x,z))) problem: DPs: TRS: h(x,c(y,z)) -> h(c(s(y),x),z) h(c(s(x),c(s(0()),y)),z) -> h(y,c(s(0()),c(x,z))) Qed