



Modal Logic: An Introduction to its Syntax and SemanticsIn this text, a variety of modal logics at the sentential, firstorder, and secondorder levels are developed with clarity, precision and philosophical insight. All of the S1S5 modal logics of Lewis and Langford, among others, are constructed. A matrix, or manyvalued semantics, for sentential modal logic is formalized, and an important result...     





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