YES Problem: a(b(c(a(x1)))) -> b(a(c(b(a(b(x1)))))) a(d(x1)) -> c(x1) a(f(f(x1))) -> g(x1) b(g(x1)) -> g(b(x1)) c(x1) -> f(f(x1)) c(a(c(x1))) -> b(c(a(b(c(x1))))) c(d(x1)) -> a(a(x1)) g(x1) -> c(a(x1)) g(x1) -> d(d(d(d(x1)))) Proof: Arctic Interpretation Processor: dimension: 1 interpretation: [g](x0) = 10x0, [f](x0) = 3x0, [d](x0) = 2x0, [b](x0) = x0, [c](x0) = 6x0, [a](x0) = 4x0 orientation: a(b(c(a(x1)))) = 14x1 >= 14x1 = b(a(c(b(a(b(x1)))))) a(d(x1)) = 6x1 >= 6x1 = c(x1) a(f(f(x1))) = 10x1 >= 10x1 = g(x1) b(g(x1)) = 10x1 >= 10x1 = g(b(x1)) c(x1) = 6x1 >= 6x1 = f(f(x1)) c(a(c(x1))) = 16x1 >= 16x1 = b(c(a(b(c(x1))))) c(d(x1)) = 8x1 >= 8x1 = a(a(x1)) g(x1) = 10x1 >= 10x1 = c(a(x1)) g(x1) = 10x1 >= 8x1 = d(d(d(d(x1)))) problem: a(b(c(a(x1)))) -> b(a(c(b(a(b(x1)))))) a(d(x1)) -> c(x1) a(f(f(x1))) -> g(x1) b(g(x1)) -> g(b(x1)) c(x1) -> f(f(x1)) c(a(c(x1))) -> b(c(a(b(c(x1))))) c(d(x1)) -> a(a(x1)) g(x1) -> c(a(x1)) Arctic Interpretation Processor: dimension: 1 interpretation: [g](x0) = x0, [f](x0) = x0, [d](x0) = 5x0, [b](x0) = x0, [c](x0) = x0, [a](x0) = x0 orientation: a(b(c(a(x1)))) = x1 >= x1 = b(a(c(b(a(b(x1)))))) a(d(x1)) = 5x1 >= x1 = c(x1) a(f(f(x1))) = x1 >= x1 = g(x1) b(g(x1)) = x1 >= x1 = g(b(x1)) c(x1) = x1 >= x1 = f(f(x1)) c(a(c(x1))) = x1 >= x1 = b(c(a(b(c(x1))))) c(d(x1)) = 5x1 >= x1 = a(a(x1)) g(x1) = x1 >= x1 = c(a(x1)) problem: a(b(c(a(x1)))) -> b(a(c(b(a(b(x1)))))) a(f(f(x1))) -> g(x1) b(g(x1)) -> g(b(x1)) c(x1) -> f(f(x1)) c(a(c(x1))) -> b(c(a(b(c(x1))))) g(x1) -> c(a(x1)) String Reversal Processor: a(c(b(a(x1)))) -> b(a(b(c(a(b(x1)))))) f(f(a(x1))) -> g(x1) g(b(x1)) -> b(g(x1)) c(x1) -> f(f(x1)) c(a(c(x1))) -> c(b(a(c(b(x1))))) g(x1) -> a(c(x1)) Matrix Interpretation Processor: dim=1 interpretation: [g](x0) = 4x0 + 8, [f](x0) = 2x0, [b](x0) = x0, [c](x0) = 4x0, [a](x0) = x0 + 4 orientation: a(c(b(a(x1)))) = 4x1 + 20 >= 4x1 + 20 = b(a(b(c(a(b(x1)))))) f(f(a(x1))) = 4x1 + 16 >= 4x1 + 8 = g(x1) g(b(x1)) = 4x1 + 8 >= 4x1 + 8 = b(g(x1)) c(x1) = 4x1 >= 4x1 = f(f(x1)) c(a(c(x1))) = 16x1 + 16 >= 16x1 + 16 = c(b(a(c(b(x1))))) g(x1) = 4x1 + 8 >= 4x1 + 4 = a(c(x1)) problem: a(c(b(a(x1)))) -> b(a(b(c(a(b(x1)))))) g(b(x1)) -> b(g(x1)) c(x1) -> f(f(x1)) c(a(c(x1))) -> c(b(a(c(b(x1))))) Arctic Interpretation Processor: dimension: 1 interpretation: [g](x0) = 3x0, [f](x0) = x0, [b](x0) = x0, [c](x0) = 2x0, [a](x0) = 6x0 orientation: a(c(b(a(x1)))) = 14x1 >= 14x1 = b(a(b(c(a(b(x1)))))) g(b(x1)) = 3x1 >= 3x1 = b(g(x1)) c(x1) = 2x1 >= x1 = f(f(x1)) c(a(c(x1))) = 10x1 >= 10x1 = c(b(a(c(b(x1))))) problem: a(c(b(a(x1)))) -> b(a(b(c(a(b(x1)))))) g(b(x1)) -> b(g(x1)) c(a(c(x1))) -> c(b(a(c(b(x1))))) String Reversal Processor: a(b(c(a(x1)))) -> b(a(c(b(a(b(x1)))))) b(g(x1)) -> g(b(x1)) c(a(c(x1))) -> b(c(a(b(c(x1))))) Matrix Interpretation Processor: dim=3 interpretation: [1 0 0] [g](x0) = [0 0 0]x0 [0 0 0] , [1 0 0] [b](x0) = [0 0 1]x0 [0 0 0] , [1 1 0] [0] [c](x0) = [0 1 1]x0 + [1] [1 0 0] [0], [1 1 1] [0] [a](x0) = [0 1 1]x0 + [1] [0 0 1] [0] orientation: [2 3 3] [1] [2 0 2] [1] a(b(c(a(x1)))) = [1 1 1]x1 + [1] >= [1 0 1]x1 + [0] = b(a(c(b(a(b(x1)))))) [0 0 0] [0] [0 0 0] [0] [1 0 0] [1 0 0] b(g(x1)) = [0 0 0]x1 >= [0 0 0]x1 = g(b(x1)) [0 0 0] [0 0 0] [3 3 2] [3] [3 1 0] [1] c(a(c(x1))) = [2 1 1]x1 + [3] >= [2 1 0]x1 + [0] = b(c(a(b(c(x1))))) [2 2 1] [1] [0 0 0] [0] problem: a(b(c(a(x1)))) -> b(a(c(b(a(b(x1)))))) b(g(x1)) -> g(b(x1)) Arctic Interpretation Processor: dimension: 2 interpretation: [0 0 ] [g](x0) = [-& 2 ]x0, [0 -&] [b](x0) = [-& -&]x0, [0 3 ] [c](x0) = [-& 0 ]x0, [0 0] [a](x0) = [0 0]x0 orientation: [3 3] [0 -&] a(b(c(a(x1)))) = [3 3]x1 >= [-& -&]x1 = b(a(c(b(a(b(x1)))))) [0 0 ] [0 -&] b(g(x1)) = [-& -&]x1 >= [-& -&]x1 = g(b(x1)) problem: b(g(x1)) -> g(b(x1)) KBO Processor: weight function: w0 = 1 w(g) = w(b) = 1 precedence: b > g problem: Qed