I would like to write a statement in python with logical implication. Something like: if x => y: do_sth() Of course, I know I could use: if (x and y) or not x: do_sth() But is there a lo...

As noted in another StackOverflow answer that I can't seem to find anymore, this pattern emerges frequently in practical Prolog code: pred(X) :- guard(X), ... pred(X) :- \+ guard(X), ... and...

Is the following theorem provable in Coq? And if not, is there a way to prove it isn't provable? Theorem not_for_all_is_exists: forall (X : Set) (P : X -> Prop), ~(forall x : X, ~ P x) -> (...

Recently the question came up what the difference is between the usual implication operator (|->) and the implies operator in SystemVerilog. Unfortunately I couldn't find a clear answer yet. How...

how to read P implies Q in classical logic? example : Distributivity: Ka(X->Y) -> (KaX -> KaY) This is modal logic which uses classical logic rules. KaX : a knows the that X is true...