A proof system for predicate logic which can tell you if a given formula is satisfiable or not (and therefore valid, by negating the formula and checking it is not satisfiable).

This is a preview. Log in through your library . Journal Information The Journal of Symbolic Logic (JSL) was founded in 1936 and it has become the leading research journal in the field. It is issued ...

You can test it out on jupyter notebook here. This is question from Discrete Mathematics and Its Applications 7th Edition by Kenneth H. Rosen. If Superman were able and willing to prevent evil, he ...

Abstract: Kripke-style semantics is suggested for the provability logic with quantifiers on proofs corresponding to the standard Gödel proof predicate. It is proved that the set of valid formulas is ...

Studia Logica: An International Journal for Symbolic Logic, Vol. 103, No. 3 (June 2015), pp. 623-638 (16 pages) Within a weak system WKVS of intuitionistic analysis one may prove, using the Weak Fan ...

Modal logic, an extension of classical logic, investigates the modes of truth such as necessity and possibility. Its development has been closely intertwined with advances in proof theory, a field ...