YES Problem: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) Proof: DP Processor: DPs: a#(b(x1)) -> d#(x1) d#(d(x1)) -> e#(x1) d#(d(x1)) -> b#(e(x1)) b#(x1) -> d#(c(x1)) e#(c(x1)) -> a#(x1) e#(c(x1)) -> d#(a(x1)) a#(x1) -> d#(x1) a#(x1) -> e#(d(x1)) TRS: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) TDG Processor: DPs: a#(b(x1)) -> d#(x1) d#(d(x1)) -> e#(x1) d#(d(x1)) -> b#(e(x1)) b#(x1) -> d#(c(x1)) e#(c(x1)) -> a#(x1) e#(c(x1)) -> d#(a(x1)) a#(x1) -> d#(x1) a#(x1) -> e#(d(x1)) TRS: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) graph: b#(x1) -> d#(c(x1)) -> d#(d(x1)) -> b#(e(x1)) b#(x1) -> d#(c(x1)) -> d#(d(x1)) -> e#(x1) e#(c(x1)) -> d#(a(x1)) -> d#(d(x1)) -> b#(e(x1)) e#(c(x1)) -> d#(a(x1)) -> d#(d(x1)) -> e#(x1) e#(c(x1)) -> a#(x1) -> a#(x1) -> e#(d(x1)) e#(c(x1)) -> a#(x1) -> a#(x1) -> d#(x1) e#(c(x1)) -> a#(x1) -> a#(b(x1)) -> d#(x1) d#(d(x1)) -> b#(e(x1)) -> b#(x1) -> d#(c(x1)) d#(d(x1)) -> e#(x1) -> e#(c(x1)) -> d#(a(x1)) d#(d(x1)) -> e#(x1) -> e#(c(x1)) -> a#(x1) a#(b(x1)) -> d#(x1) -> d#(d(x1)) -> b#(e(x1)) a#(b(x1)) -> d#(x1) -> d#(d(x1)) -> e#(x1) a#(x1) -> e#(d(x1)) -> e#(c(x1)) -> d#(a(x1)) a#(x1) -> e#(d(x1)) -> e#(c(x1)) -> a#(x1) a#(x1) -> d#(x1) -> d#(d(x1)) -> b#(e(x1)) a#(x1) -> d#(x1) -> d#(d(x1)) -> e#(x1) EDG Processor: DPs: a#(b(x1)) -> d#(x1) d#(d(x1)) -> e#(x1) d#(d(x1)) -> b#(e(x1)) b#(x1) -> d#(c(x1)) e#(c(x1)) -> a#(x1) e#(c(x1)) -> d#(a(x1)) a#(x1) -> d#(x1) a#(x1) -> e#(d(x1)) TRS: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) graph: e#(c(x1)) -> d#(a(x1)) -> d#(d(x1)) -> e#(x1) e#(c(x1)) -> d#(a(x1)) -> d#(d(x1)) -> b#(e(x1)) e#(c(x1)) -> a#(x1) -> a#(b(x1)) -> d#(x1) e#(c(x1)) -> a#(x1) -> a#(x1) -> d#(x1) e#(c(x1)) -> a#(x1) -> a#(x1) -> e#(d(x1)) d#(d(x1)) -> b#(e(x1)) -> b#(x1) -> d#(c(x1)) d#(d(x1)) -> e#(x1) -> e#(c(x1)) -> a#(x1) d#(d(x1)) -> e#(x1) -> e#(c(x1)) -> d#(a(x1)) a#(b(x1)) -> d#(x1) -> d#(d(x1)) -> e#(x1) a#(b(x1)) -> d#(x1) -> d#(d(x1)) -> b#(e(x1)) a#(x1) -> e#(d(x1)) -> e#(c(x1)) -> a#(x1) a#(x1) -> e#(d(x1)) -> e#(c(x1)) -> d#(a(x1)) a#(x1) -> d#(x1) -> d#(d(x1)) -> e#(x1) a#(x1) -> d#(x1) -> d#(d(x1)) -> b#(e(x1)) SCC Processor: #sccs: 1 #rules: 6 #arcs: 14/64 DPs: e#(c(x1)) -> d#(a(x1)) d#(d(x1)) -> e#(x1) e#(c(x1)) -> a#(x1) a#(x1) -> e#(d(x1)) a#(x1) -> d#(x1) a#(b(x1)) -> d#(x1) TRS: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) Arctic Interpretation Processor: dimension: 2 usable rules: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) interpretation: [e#](x0) = [0 0]x0, [d#](x0) = [0 0]x0, [a#](x0) = [1 1]x0, [0 -&] [e](x0) = [0 -&]x0, [1 1] [c](x0) = [0 1]x0, [0 0] [d](x0) = [1 1]x0, [0 0] [a](x0) = [0 0]x0, [1 1] [b](x0) = [2 2]x0 orientation: e#(c(x1)) = [1 1]x1 >= [0 0]x1 = d#(a(x1)) d#(d(x1)) = [1 1]x1 >= [0 0]x1 = e#(x1) e#(c(x1)) = [1 1]x1 >= [1 1]x1 = a#(x1) a#(x1) = [1 1]x1 >= [1 1]x1 = e#(d(x1)) a#(x1) = [1 1]x1 >= [0 0]x1 = d#(x1) a#(b(x1)) = [3 3]x1 >= [0 0]x1 = d#(x1) [2 2] [2 2] a(b(x1)) = [2 2]x1 >= [2 2]x1 = c(d(x1)) [1 1] [1 -&] d(d(x1)) = [2 2]x1 >= [2 -&]x1 = b(e(x1)) [1 1] [1 1] b(x1) = [2 2]x1 >= [2 2]x1 = d(c(x1)) [0 0] d(x1) = [1 1]x1 >= x1 = x1 [1 1] [0 0] e(c(x1)) = [1 1]x1 >= [1 1]x1 = d(a(x1)) [0 0] [0 0] a(x1) = [0 0]x1 >= [0 0]x1 = e(d(x1)) problem: DPs: e#(c(x1)) -> a#(x1) a#(x1) -> e#(d(x1)) TRS: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) Restore Modifier: DPs: e#(c(x1)) -> a#(x1) a#(x1) -> e#(d(x1)) TRS: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) EDG Processor: DPs: e#(c(x1)) -> a#(x1) a#(x1) -> e#(d(x1)) TRS: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) graph: e#(c(x1)) -> a#(x1) -> a#(x1) -> e#(d(x1)) a#(x1) -> e#(d(x1)) -> e#(c(x1)) -> a#(x1) Arctic Interpretation Processor: dimension: 2 usable rules: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) interpretation: [e#](x0) = [0 2]x0 + [0], [a#](x0) = [2 2]x0 + [1], [-& 0 ] [0 ] [e](x0) = [-& 0 ]x0 + [-&], [0 0] [0] [c](x0) = [1 1]x0 + [1], [1 1] [1 ] [d](x0) = [0 0]x0 + [-&], [0 0] [0] [a](x0) = [0 0]x0 + [0], [2 2] [2] [b](x0) = [1 1]x0 + [1] orientation: e#(c(x1)) = [3 3]x1 + [3] >= [2 2]x1 + [1] = a#(x1) a#(x1) = [2 2]x1 + [1] >= [2 2]x1 + [1] = e#(d(x1)) [2 2] [2] [1 1] [1] a(b(x1)) = [2 2]x1 + [2] >= [2 2]x1 + [2] = c(d(x1)) [2 2] [2] [-& 2 ] [2] d(d(x1)) = [1 1]x1 + [1] >= [-& 1 ]x1 + [1] = b(e(x1)) [2 2] [2] [2 2] [2] b(x1) = [1 1]x1 + [1] >= [1 1]x1 + [1] = d(c(x1)) [1 1] [1 ] d(x1) = [0 0]x1 + [-&] >= x1 = x1 [1 1] [1] [1 1] [1] e(c(x1)) = [1 1]x1 + [1] >= [0 0]x1 + [0] = d(a(x1)) [0 0] [0] [0 0] [0 ] a(x1) = [0 0]x1 + [0] >= [0 0]x1 + [-&] = e(d(x1)) problem: DPs: a#(x1) -> e#(d(x1)) TRS: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) Restore Modifier: DPs: a#(x1) -> e#(d(x1)) TRS: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) EDG Processor: DPs: a#(x1) -> e#(d(x1)) TRS: a(b(x1)) -> c(d(x1)) d(d(x1)) -> b(e(x1)) b(x1) -> d(c(x1)) d(x1) -> x1 e(c(x1)) -> d(a(x1)) a(x1) -> e(d(x1)) graph: Qed