Richard Zach
Boxes and Diamonds
An Open Introduction to Modal Logic

Boxes and Diamonds An Open Introduction to Modal Logic

Richard Zach2019
A textbook on modal and other intensional logics. It covers normal modal logics, relational semantics, axiomatic and tableaux proof systems, intuitionistic logic, and counterfactual conditionals. It is based on the Open Logic Project and available for free download at openlogicproject.org.
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