Model-completion of varieties of co-Heyting algebras

Details Model-completion of varieties of co-Heyting algebras Model-completion of varieties of co-Heyting algebras

2010-01-11

arxiv.org/abs/1001.1663v1

Mathematics

Logic

28 pages

Scientific paper

It is known that exactly eight varieties of Heyting algebras have a model-completion, but no concrete axiomatisation of these model-completions were known by now except for the trivial variety (reduced to the one-point algebra) and the variety of Boolean algebras. For each of the six remaining varieties we introduce two axioms and show that 1) these axioms are satisfied by all the algebras in the model-completion, and 2) all the algebras in this variety satisfying these two axioms have a certain embedding property. For four of these six varieties (those which are locally finite) this actually provides a new proof of the existence of a model-completion, this time with an explicit and finite axiomatisation.

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