Logic and Truth Tables

Logic Primer: The Logic Primer is a book by Collin Allen which employs systems of natural deduction as a means of representing arguments, and it adopts Lemmon's technique of explicitly tracking assumptions on each line of a proof. This technique illuminates the relation between conclusions and premises better than other devices for managing assumptions.

An Interactive Gateway to Logic: This site is an interactive site which explores truth tables and other operations in classical propositional logic and some multi-valued logics.