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1
EN
Varieties of topological quasi-Boolean algebras in the vicinity of pre-rough algebras [28, 29] are expanded to residuated algebraic structures by introducing a new implication operation and its residual in these structures. Sequent calculi for some classes of residuated algebraic structures are established. These sequent calculi have the strong finite model property which yields the decidability of the word problem for corresponding classes of algebraic structures.
EN
We analyze semantically the logical inference rules in cut-free sequent calculi for the modal logics which are obtained from the least normal logic K by adding axioms from T, 4, 5, D and B. This implies Kripke completeness, as well as the cutelimination property or the subformula property of the calculi. By slightly modifying the arguments, the finite model property of the logics also follows.
3
Content available remote On Finite Model Property of the Equational Theory of Kleene Algebras
EN
The finite model property of the equational fragment of the theory of Kleene algebras is a consequence of Kozen's [3] completeness theorem. We show that, conversely, this completeness theorem can be proved assuming the finite model property of this fragment.
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