LEGO
LEGO is an interactive proof development system (proof assistant). It implements various related type systems - the Edinburgh Logical Framework (LF), the Calculus of Constructions (CC), the Generalized Calculus of Constructions (GCC) and the Unified Theory of Dependent Types (UTT). LEGO is a powerful tool for interactive proof development in the natural deduction style. It supports refinement proof as a basic operation. The system design emphasizes removing the more tedious aspects of interactive proofs.
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Current Version: 1.3.1
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