Twelf
= Twelf
{wiki=Twelf}
Twelf is a software tool and framework for specifying, implementing, and proving properties of programming languages, particularly those that involve type systems and formal semantics. It is based on a logical framework called LF (Logical Framework), which provides a way to represent syntax, rules, and proofs in a uniform way. Twelf is primarily used in the field of programming language research and type theory.