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Distributive semilattices as retracts of ultraboolean ones; functorial inverses without adjunction

Friedrich Wehrung
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Abstract

A (v,0)-semilattice is ultraboolean, if it is a directed union of finite Boolean (v,0)-semilattices. We prove that every distributive (v,0)-semilattice is a retract of some ultraboolean (v,0)-semilattices. This is established by proving that every finite distributive (v,0)-semilattice is a retract of some finite Boolean (v,0)-semilattice, and this in a functorial way. This result is, in turn, obtained as a particular case of a category-theoretical result that gives sufficient conditions, for a functor $ Pi$, to admit a right inverse. The particular functor $ Pi$ used for the abovementioned result about ultraboolean semilattices has neither a right nor a left adjoint.

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Friedrich Wehrung. 2005-08-30. Distributive semilattices as retracts of ultraboolean ones; functorial inverses without adjunction. https://arxiv.org/abs/math/0409263

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