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VARIETIES OF PSEUDO-BOOLEAN ALGEBRAS
Let L be one of the intuitionistic modal logics considered in [4]. As in the classical modal case (see [7]), we define two different forms of the Beth property for L, which are denoted by B 1 and B 2 ; in this paper we study the relation among B 1 ,B 2 and the interpolation properties C 1 and C 2 , introduced in [4]. It turns out that C 1 implies B 1 , but contrary to the boolean case, is not equivalent to B 1 . It is shown that B 2 and C 2 are independent, and moreover it comes out that, in contrast to classical case, there exists an extension of the intuitionistic modal logic of S 4 -type, that has not the property B 2 . Finally we give two algebraic properties, that characterize respectively B 1 and B 2 .
Archive for Mathematical Logic – Springer Journals
Published: Jul 1, 2002
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