MAYBE We are left with following problem, upon which TcT provides the certificate MAYBE. Strict Trs: { active(fact(X)) -> fact(active(X)) , active(fact(X)) -> mark(if(zero(X), s(0()), prod(X, fact(p(X))))) , active(if(X1, X2, X3)) -> if(active(X1), X2, X3) , active(if(true(), X, Y)) -> mark(X) , active(if(false(), X, Y)) -> mark(Y) , active(zero(X)) -> zero(active(X)) , active(zero(s(X))) -> mark(false()) , active(zero(0())) -> mark(true()) , active(s(X)) -> s(active(X)) , active(prod(X1, X2)) -> prod(X1, active(X2)) , active(prod(X1, X2)) -> prod(active(X1), X2) , active(prod(s(X), Y)) -> mark(add(Y, prod(X, Y))) , active(prod(0(), X)) -> mark(0()) , active(p(X)) -> p(active(X)) , active(p(s(X))) -> mark(X) , active(add(X1, X2)) -> add(X1, active(X2)) , active(add(X1, X2)) -> add(active(X1), X2) , active(add(s(X), Y)) -> mark(s(add(X, Y))) , active(add(0(), X)) -> mark(X) , fact(mark(X)) -> mark(fact(X)) , fact(ok(X)) -> ok(fact(X)) , if(mark(X1), X2, X3) -> mark(if(X1, X2, X3)) , if(ok(X1), ok(X2), ok(X3)) -> ok(if(X1, X2, X3)) , zero(mark(X)) -> mark(zero(X)) , zero(ok(X)) -> ok(zero(X)) , s(mark(X)) -> mark(s(X)) , s(ok(X)) -> ok(s(X)) , prod(X1, mark(X2)) -> mark(prod(X1, X2)) , prod(mark(X1), X2) -> mark(prod(X1, X2)) , prod(ok(X1), ok(X2)) -> ok(prod(X1, X2)) , p(mark(X)) -> mark(p(X)) , p(ok(X)) -> ok(p(X)) , add(X1, mark(X2)) -> mark(add(X1, X2)) , add(mark(X1), X2) -> mark(add(X1, X2)) , add(ok(X1), ok(X2)) -> ok(add(X1, X2)) , proper(fact(X)) -> fact(proper(X)) , proper(if(X1, X2, X3)) -> if(proper(X1), proper(X2), proper(X3)) , proper(zero(X)) -> zero(proper(X)) , proper(s(X)) -> s(proper(X)) , proper(0()) -> ok(0()) , proper(prod(X1, X2)) -> prod(proper(X1), proper(X2)) , proper(p(X)) -> p(proper(X)) , proper(add(X1, X2)) -> add(proper(X1), proper(X2)) , proper(true()) -> ok(true()) , proper(false()) -> ok(false()) , top(mark(X)) -> top(proper(X)) , top(ok(X)) -> top(active(X)) } Obligation: innermost runtime complexity Answer: MAYBE None of the processors succeeded. Details of failed attempt(s): ----------------------------- 1) 'empty' failed due to the following reason: Empty strict component of the problem is NOT empty. 2) 'Best' failed due to the following reason: None of the processors succeeded. Details of failed attempt(s): ----------------------------- 1) 'WithProblem (timeout of 60 seconds)' failed due to the following reason: Computation stopped due to timeout after 60.0 seconds. 2) 'Best' failed due to the following reason: None of the processors succeeded. Details of failed attempt(s): ----------------------------- 1) 'WithProblem (timeout of 30 seconds) (timeout of 60 seconds)' failed due to the following reason: Computation stopped due to timeout after 30.0 seconds. 2) 'Best' failed due to the following reason: None of the processors succeeded. Details of failed attempt(s): ----------------------------- 1) 'bsearch-popstar (timeout of 60 seconds)' failed due to the following reason: The input cannot be shown compatible 2) 'Polynomial Path Order (PS) (timeout of 60 seconds)' failed due to the following reason: The input cannot be shown compatible 3) 'Fastest (timeout of 5 seconds) (timeout of 60 seconds)' failed due to the following reason: None of the processors succeeded. Details of failed attempt(s): ----------------------------- 1) 'Bounds with minimal-enrichment and initial automaton 'match'' failed due to the following reason: match-boundness of the problem could not be verified. 2) 'Bounds with perSymbol-enrichment and initial automaton 'match'' failed due to the following reason: match-boundness of the problem could not be verified. Arrrr..