YES Problem: a__f(f(X)) -> a__c(f(g(f(X)))) a__c(X) -> d(X) a__h(X) -> a__c(d(X)) mark(f(X)) -> a__f(mark(X)) mark(c(X)) -> a__c(X) mark(h(X)) -> a__h(mark(X)) mark(g(X)) -> g(X) mark(d(X)) -> d(X) a__f(X) -> f(X) a__c(X) -> c(X) a__h(X) -> h(X) Proof: DP Processor: DPs: a__f#(f(X)) -> a__c#(f(g(f(X)))) a__h#(X) -> a__c#(d(X)) mark#(f(X)) -> mark#(X) mark#(f(X)) -> a__f#(mark(X)) mark#(c(X)) -> a__c#(X) mark#(h(X)) -> mark#(X) mark#(h(X)) -> a__h#(mark(X)) TRS: a__f(f(X)) -> a__c(f(g(f(X)))) a__c(X) -> d(X) a__h(X) -> a__c(d(X)) mark(f(X)) -> a__f(mark(X)) mark(c(X)) -> a__c(X) mark(h(X)) -> a__h(mark(X)) mark(g(X)) -> g(X) mark(d(X)) -> d(X) a__f(X) -> f(X) a__c(X) -> c(X) a__h(X) -> h(X) Matrix Interpretation Processor: dim=3 interpretation: [mark#](x0) = [0 1 1]x0 + [1], [a__h#](x0) = [1], [a__c#](x0) = [0], [a__f#](x0) = [0 0 1]x0, [0 0 0] [0] [h](x0) = [1 0 0]x0 + [0] [0 1 1] [1], [0 0 0] [c](x0) = [0 0 0]x0 [0 0 1] , [0 0 0] [mark](x0) = [0 0 0]x0 [1 1 1] , [0 1 0] [0] [a__h](x0) = [1 0 0]x0 + [0] [0 1 1] [1], [0 0 0] [d](x0) = [0 0 0]x0 [0 0 1] , [0 0 0] [a__c](x0) = [0 0 0]x0 [0 0 1] , [0] [g](x0) = [0] [1], [0 0 0] [0] [a__f](x0) = [1 1 0]x0 + [0] [1 1 1] [1], [0 0 0] [0] [f](x0) = [1 1 0]x0 + [0] [0 1 1] [1] orientation: a__f#(f(X)) = [0 1 1]X + [1] >= [0] = a__c#(f(g(f(X)))) a__h#(X) = [1] >= [0] = a__c#(d(X)) mark#(f(X)) = [1 2 1]X + [2] >= [0 1 1]X + [1] = mark#(X) mark#(f(X)) = [1 2 1]X + [2] >= [1 1 1]X = a__f#(mark(X)) mark#(c(X)) = [0 0 1]X + [1] >= [0] = a__c#(X) mark#(h(X)) = [1 1 1]X + [2] >= [0 1 1]X + [1] = mark#(X) mark#(h(X)) = [1 1 1]X + [2] >= [1] = a__h#(mark(X)) [0 0 0] [0] [0] a__f(f(X)) = [1 1 0]X + [0] >= [0] = a__c(f(g(f(X)))) [1 2 1] [2] [2] [0 0 0] [0 0 0] a__c(X) = [0 0 0]X >= [0 0 0]X = d(X) [0 0 1] [0 0 1] [0 1 0] [0] [0 0 0] a__h(X) = [1 0 0]X + [0] >= [0 0 0]X = a__c(d(X)) [0 1 1] [1] [0 0 1] [0 0 0] [0] [0 0 0] [0] mark(f(X)) = [0 0 0]X + [0] >= [0 0 0]X + [0] = a__f(mark(X)) [1 2 1] [1] [1 1 1] [1] [0 0 0] [0 0 0] mark(c(X)) = [0 0 0]X >= [0 0 0]X = a__c(X) [0 0 1] [0 0 1] [0 0 0] [0] [0 0 0] [0] mark(h(X)) = [0 0 0]X + [0] >= [0 0 0]X + [0] = a__h(mark(X)) [1 1 1] [1] [1 1 1] [1] [0] [0] mark(g(X)) = [0] >= [0] = g(X) [1] [1] [0 0 0] [0 0 0] mark(d(X)) = [0 0 0]X >= [0 0 0]X = d(X) [0 0 1] [0 0 1] [0 0 0] [0] [0 0 0] [0] a__f(X) = [1 1 0]X + [0] >= [1 1 0]X + [0] = f(X) [1 1 1] [1] [0 1 1] [1] [0 0 0] [0 0 0] a__c(X) = [0 0 0]X >= [0 0 0]X = c(X) [0 0 1] [0 0 1] [0 1 0] [0] [0 0 0] [0] a__h(X) = [1 0 0]X + [0] >= [1 0 0]X + [0] = h(X) [0 1 1] [1] [0 1 1] [1] problem: DPs: TRS: a__f(f(X)) -> a__c(f(g(f(X)))) a__c(X) -> d(X) a__h(X) -> a__c(d(X)) mark(f(X)) -> a__f(mark(X)) mark(c(X)) -> a__c(X) mark(h(X)) -> a__h(mark(X)) mark(g(X)) -> g(X) mark(d(X)) -> d(X) a__f(X) -> f(X) a__c(X) -> c(X) a__h(X) -> h(X) Qed