Resources collected by Renate Schmidt.
A discussion of modal logic by John McCarthy.
Originally the study of deductive behavior of the expressions `it is necessary that' and `it is possible that', now also includes logics for belief, tense, the deontic (moral) expressions. From the Stanford Encyclopedia, by James W. Garson.
A concise introduction to modal logics by Anthony A. Aaby.
Online book by J. Jay Zeman.
Several normal propositional modal logics are systematically presented in the calculus of structures and cut elimination is proved. By Alessio Guglielmi.
Article by J. McCarthy on the use of modality in artificial intelligence.
Discussion of Ernst Mally's logic of obligation; from the Stanford Encyclopedia by Gert-Jan Lokhorst.
An extensive overview of the subject.
Wikipedia article.
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