Source: Notre Dame J. Formal Logic Volume 51, Number 4
(2010), 485-502.
With each superintuitionistic propositional logic L with a disjunction
property we associate a set of modal logics the assertoric fragment of which is
L. Each formula of these modal logics is interdeducible with a
formula representing a set of rules admissible in L. The smallest of
these logics contains only formulas representing derivable in L rules
while the greatest one contains formulas corresponding to all admissible in
L rules. The algebraic semantic for these logics is described.
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