Geodesic
Densities of Ultraproducts of Boolean Algebras
Canadian journal of mathematics, Tome 47 (1995) no. 1, pp. 132-145

Voir la notice de l'article provenant de la source Cambridge University Press

We answer three problems by J. D. Monk on cardinal invariants of Boolean algebras. Two of these are whether taking the algebraic density πA resp. the topological density cL4 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.
DOI : 10.4153/CJM-1995-007-0
Mots-clés : 03C20, 03E10, 06E05, Boolean algebra, ultraproduct, density, π-weight 
Koppelberg, Sabine; Shelah, Saharon. Densities of Ultraproducts of Boolean Algebras. Canadian journal of mathematics, Tome 47 (1995) no. 1, pp. 132-145. doi: 10.4153/CJM-1995-007-0
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