Resources collected by Renate Schmidt.
Discussion of Ernst Mally's logic of obligation; from the Stanford Encyclopedia by Gert-Jan Lokhorst.
An extensive overview of the subject.
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.
Online book by J. Jay Zeman.
Open Encyclopedia article.
Several normal propositional modal logics are systematically presented in the calculus of structures and cut elimination is proved. By Alessio Guglielmi.
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