- Introduction to Logic, for Liberal Arts and Business Majors,

by Stefan Waner and Steven R. Costenoble, Hofstra University

- Notes on set theory, logic, proof, etc,

from Cal State, San Bernardino

- About Proof by Induction,

by David Sumner, University of South Carolina

- A Crash Course in the Mathematics of Infinite Sets,

by Peter Suber, Earlham College

- A home page for the Axiom of Choice,

by Eric Schechter, Vanderbilt University

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