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forall x is an Open Education Resource (OER) introductory textbook in formal logic. It covers translation, proofs, and formal semantics for sentential and predicate logic.
It is available under a Creative Commons license. There is no charge to use the book either as a text for a course or for self-directed study, and you are welcome to revise it to fit your needs. It is available as a free download, and you can make hardcopies without owing anything.
If you have any thoughts or questions about the book, please e-mail me.
This page is © P.D. Magnus and is offered under the Creative Commons license. Some rights reserved. (Attribution 4.0)