On Weak and Strong Interpolation in Algebraic Logics

Details On Weak and Strong Interpolation in Algebraic Logics On Weak and Strong Interpolation in Algebraic Logics

2006-12-09

arxiv.org/abs/math/0612244v1

Mathematics

Logic

Scientific paper

We show that there is a restriction, or modification of the finite-variable fragments of First Order Logic in which a weak form of Craig's Interpolation Theorem holds, but a strong form of this theorem does not hold. Translating these results into Algebraic Logic we obtain a finitely axiomatizable subvariety of finite dimensional Representable Cylindric Algebras that has the Strong Amalgamation Property, but does not have the Superamalgamation Property. This settles a conjecture of Pigozzi

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