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Bare canonicity of representable cylindric and polyadic algebras (1202.5961v1)
Published 27 Feb 2012 in math.LO and cs.LO
Abstract: We show that for finite n at least 3, every first-order axiomatisation of the varieties of representable n-dimensional cylindric algebras, diagonal-free cylindric algebras, polyadic algebras, and polyadic equality algebras contains an infinite number of non-canonical formulas. We also show that the class of structures for each of these varieties is non-elementary. The proofs employ algebras derived from random graphs.