Richard Zach is a Canadian logician, philosopher of mathematics, and historian of logic and analytic philosophy. He is currently Professor of Philosophy at the University of Calgary. (From Wikipedia)
More about Richard Zach: Associated authors:Books by Richard Zach:
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Zach, Richard: Forall X Calgary: An Introduction to Formal Logic, also by P. D. Magnus, Tim Button, J. Robert Loftis, Robert Trueman, and Aaron Thomas-Bolduc (multiple formats with commentary at openlogicproject.org)
Find more by Richard Zach at your library, or elsewhere.