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arXiv:math/9404226 [math.LO]AbstractReferencesReviewsResources

Densities of ultraproducts of Boolean algebras

Sabine Koppelberg, Saharon Shelah

Published 1994-04-15Version 1

We answer three problems by J. D. Monk on cardinal invariants of Boolean algebras. Two of these are whether taking the algebraic density pi(A), resp. the topological density d(A), of a Boolean algebra A commutes with formation of ultraproducts; the third one compares the number of endomorphisms and of ideals of a Boolean algebra.

Journal: Canad. J. Math. 47 (1995), 132--145
Categories: math.LO, math.GN
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