YES Problem: a(b(x1)) -> x1 a(c(x1)) -> c(c(x1)) b(c(x1)) -> a(b(a(b(x1)))) Proof: DP Processor: DPs: b#(c(x1)) -> b#(x1) b#(c(x1)) -> a#(b(x1)) b#(c(x1)) -> b#(a(b(x1))) b#(c(x1)) -> a#(b(a(b(x1)))) TRS: a(b(x1)) -> x1 a(c(x1)) -> c(c(x1)) b(c(x1)) -> a(b(a(b(x1)))) TDG Processor: DPs: b#(c(x1)) -> b#(x1) b#(c(x1)) -> a#(b(x1)) b#(c(x1)) -> b#(a(b(x1))) b#(c(x1)) -> a#(b(a(b(x1)))) TRS: a(b(x1)) -> x1 a(c(x1)) -> c(c(x1)) b(c(x1)) -> a(b(a(b(x1)))) graph: b#(c(x1)) -> b#(a(b(x1))) -> b#(c(x1)) -> a#(b(a(b(x1)))) b#(c(x1)) -> b#(a(b(x1))) -> b#(c(x1)) -> b#(a(b(x1))) b#(c(x1)) -> b#(a(b(x1))) -> b#(c(x1)) -> a#(b(x1)) b#(c(x1)) -> b#(a(b(x1))) -> b#(c(x1)) -> b#(x1) b#(c(x1)) -> b#(x1) -> b#(c(x1)) -> a#(b(a(b(x1)))) b#(c(x1)) -> b#(x1) -> b#(c(x1)) -> b#(a(b(x1))) b#(c(x1)) -> b#(x1) -> b#(c(x1)) -> a#(b(x1)) b#(c(x1)) -> b#(x1) -> b#(c(x1)) -> b#(x1) SCC Processor: #sccs: 1 #rules: 2 #arcs: 8/16 DPs: b#(c(x1)) -> b#(a(b(x1))) b#(c(x1)) -> b#(x1) TRS: a(b(x1)) -> x1 a(c(x1)) -> c(c(x1)) b(c(x1)) -> a(b(a(b(x1)))) Arctic Interpretation Processor: dimension: 1 usable rules: a(b(x1)) -> x1 a(c(x1)) -> c(c(x1)) b(c(x1)) -> a(b(a(b(x1)))) interpretation: [b#](x0) = 2x0 + 8, [c](x0) = 2x0 + 10, [a](x0) = 2x0 + 1, [b](x0) = -2x0 + 2 orientation: b#(c(x1)) = 4x1 + 12 >= 2x1 + 8 = b#(a(b(x1))) b#(c(x1)) = 4x1 + 12 >= 2x1 + 8 = b#(x1) a(b(x1)) = x1 + 4 >= x1 = x1 a(c(x1)) = 4x1 + 12 >= 4x1 + 12 = c(c(x1)) b(c(x1)) = x1 + 8 >= x1 + 4 = a(b(a(b(x1)))) problem: DPs: TRS: a(b(x1)) -> x1 a(c(x1)) -> c(c(x1)) b(c(x1)) -> a(b(a(b(x1)))) Qed