The Craig, Robinson and Beth theorems for the modal logic of closure spaces

Bulletin of the Section of Logic 15 (1):15-18 (1986)
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Abstract

The first order modal logic of closure spaces belongs to the class of equationally definable standard modal logics . One can say, it satisfies no version of the deduction lemma. Nevertheless the Robinson and Beth theorems can be proved by means of an interpretation of modal theories in classical ones. LCS is described in [1], [2], [3], [4]. The logics obtained by adjoining axioms of quasi-equality or of equality to LCS are denoted by LCSQE and LCSE

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Jan Plaza
State University of New York (SUNY)

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An algebraic approach to non-classical logics.Helena Rasiowa - 1974 - Warszawa,: PWN - Polish Scientific Publishers.

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