YES(O(1),O(1)) We are left with following problem, upon which TcT provides the certificate YES(O(1),O(1)). Strict Trs: { not(x) -> xor(x, true()) , implies(x, y) -> xor(and(x, y), xor(x, true())) , or(x, y) -> xor(and(x, y), xor(x, y)) , =(x, y) -> xor(x, xor(y, true())) } Obligation: innermost runtime complexity Answer: YES(O(1),O(1)) We use the processor 'Small Polynomial Path Order (PS,1-bounded)' to orient following rules strictly. Trs: { not(x) -> xor(x, true()) , implies(x, y) -> xor(and(x, y), xor(x, true())) , or(x, y) -> xor(and(x, y), xor(x, y)) , =(x, y) -> xor(x, xor(y, true())) } The induced complexity on above rules (modulo remaining rules) is YES(?,O(1)) . These rules are moved into the corresponding weak component(s). Sub-proof: ---------- The input was oriented with the instance of 'Small Polynomial Path Order (PS,1-bounded)' as induced by the safe mapping safe(not) = {}, safe(xor) = {1, 2}, safe(true) = {}, safe(implies) = {2}, safe(and) = {1, 2}, safe(or) = {1, 2}, safe(=) = {1} and precedence not > =, or > =, not ~ or . Following symbols are considered recursive: {} The recursion depth is 0. For your convenience, here are the satisfied ordering constraints: not(x;) > xor(; x, true()) implies(x; y) > xor(; and(; x, y), xor(; x, true())) or(; x, y) > xor(; and(; x, y), xor(; x, y)) =(y; x) > xor(; x, xor(; y, true())) We return to the main proof. We are left with following problem, upon which TcT provides the certificate YES(O(1),O(1)). Weak Trs: { not(x) -> xor(x, true()) , implies(x, y) -> xor(and(x, y), xor(x, true())) , or(x, y) -> xor(and(x, y), xor(x, y)) , =(x, y) -> xor(x, xor(y, true())) } Obligation: innermost runtime complexity Answer: YES(O(1),O(1)) Empty rules are trivially bounded Hurray, we answered YES(O(1),O(1))