YES Problem: a(a(x1)) -> b(x1) a(b(x1)) -> c(c(x1)) b(c(x1)) -> b(a(a(x1))) Proof: String Reversal Processor: a(a(x1)) -> b(x1) b(a(x1)) -> c(c(x1)) c(b(x1)) -> a(a(b(x1))) DP Processor: DPs: a#(a(x1)) -> b#(x1) b#(a(x1)) -> c#(x1) b#(a(x1)) -> c#(c(x1)) c#(b(x1)) -> a#(b(x1)) c#(b(x1)) -> a#(a(b(x1))) TRS: a(a(x1)) -> b(x1) b(a(x1)) -> c(c(x1)) c(b(x1)) -> a(a(b(x1))) TDG Processor: DPs: a#(a(x1)) -> b#(x1) b#(a(x1)) -> c#(x1) b#(a(x1)) -> c#(c(x1)) c#(b(x1)) -> a#(b(x1)) c#(b(x1)) -> a#(a(b(x1))) TRS: a(a(x1)) -> b(x1) b(a(x1)) -> c(c(x1)) c(b(x1)) -> a(a(b(x1))) graph: c#(b(x1)) -> a#(b(x1)) -> a#(a(x1)) -> b#(x1) c#(b(x1)) -> a#(a(b(x1))) -> a#(a(x1)) -> b#(x1) b#(a(x1)) -> c#(c(x1)) -> c#(b(x1)) -> a#(a(b(x1))) b#(a(x1)) -> c#(c(x1)) -> c#(b(x1)) -> a#(b(x1)) b#(a(x1)) -> c#(x1) -> c#(b(x1)) -> a#(a(b(x1))) b#(a(x1)) -> c#(x1) -> c#(b(x1)) -> a#(b(x1)) a#(a(x1)) -> b#(x1) -> b#(a(x1)) -> c#(c(x1)) a#(a(x1)) -> b#(x1) -> b#(a(x1)) -> c#(x1) Arctic Interpretation Processor: dimension: 4 interpretation: [c#](x0) = [0 0 1 0]x0 + [0], [b#](x0) = [0 0 0 0]x0 + [0], [a#](x0) = [0 -& 0 0 ]x0 + [0], [0 0 1 0 ] [-&] [-& -& 1 0 ] [-&] [c](x0) = [0 -& 0 -&]x0 + [-&] [-& 0 1 0 ] [0 ], [0 0 0 0] [-&] [0 0 0 0] [-&] [b](x0) = [0 0 0 0]x0 + [0 ] [0 0 0 0] [0 ], [0 0 -& 0 ] [-&] [1 0 1 0 ] [-&] [a](x0) = [0 -& 0 0 ]x0 + [-&] [0 0 0 0 ] [0 ] orientation: a#(a(x1)) = [0 0 0 0]x1 + [0] >= [0 0 0 0]x1 + [0] = b#(x1) b#(a(x1)) = [1 0 1 0]x1 + [0] >= [0 0 1 0]x1 + [0] = c#(x1) b#(a(x1)) = [1 0 1 0]x1 + [0] >= [1 0 1 0]x1 + [0] = c#(c(x1)) c#(b(x1)) = [1 1 1 1]x1 + [1] >= [0 0 0 0]x1 + [0] = a#(b(x1)) c#(b(x1)) = [1 1 1 1]x1 + [1] >= [0 0 0 0]x1 + [0] = a#(a(b(x1))) [1 0 1 0] [0] [0 0 0 0] [-&] [1 1 1 1] [0] [0 0 0 0] [-&] a(a(x1)) = [0 0 0 0]x1 + [0] >= [0 0 0 0]x1 + [0 ] = b(x1) [1 0 1 0] [0] [0 0 0 0] [0 ] [1 0 1 0] [0] [1 0 1 0] [0 ] [1 0 1 0] [0] [1 0 1 0] [0 ] b(a(x1)) = [1 0 1 0]x1 + [0] >= [0 0 1 0]x1 + [-&] = c(c(x1)) [1 0 1 0] [0] [1 0 1 0] [0 ] [1 1 1 1] [1] [1 1 1 1] [1] [1 1 1 1] [1] [1 1 1 1] [1] c(b(x1)) = [0 0 0 0]x1 + [0] >= [0 0 0 0]x1 + [0] = a(a(b(x1))) [1 1 1 1] [1] [1 1 1 1] [1] problem: DPs: a#(a(x1)) -> b#(x1) b#(a(x1)) -> c#(x1) b#(a(x1)) -> c#(c(x1)) TRS: a(a(x1)) -> b(x1) b(a(x1)) -> c(c(x1)) c(b(x1)) -> a(a(b(x1))) EDG Processor: DPs: a#(a(x1)) -> b#(x1) b#(a(x1)) -> c#(x1) b#(a(x1)) -> c#(c(x1)) TRS: a(a(x1)) -> b(x1) b(a(x1)) -> c(c(x1)) c(b(x1)) -> a(a(b(x1))) graph: a#(a(x1)) -> b#(x1) -> b#(a(x1)) -> c#(x1) a#(a(x1)) -> b#(x1) -> b#(a(x1)) -> c#(c(x1)) SCC Processor: #sccs: 0 #rules: 0 #arcs: 2/9