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Formal Predicate Calculus, contains a systematic formal development with axiomatic proof
forall x: an introduction to formal logic, by P.D. Magnus, covers formal semantics and proof theory for sentential logic.
Chapter 2 / Propositional Logic from Logic In Action
Propositional sequent calculus prover on Project Nayuki. (note: implication can be input in the form !X|Y, and a sequent can be a single formula prefixed with > and having no commas)
Propositional Logic - A Generative Grammar
A Propositional Calculator that helps to understand simple expressions
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