Saharon Shelah (1996)
Fundamenta Mathematicae
Similarity:
We deal with Boolean algebras and their cardinal functions: π-weight π and π-character πχ. We investigate the spectrum of π-weights of subalgebras of a Boolean algebra B. Next we show that the π-character of an ultraproduct of Boolean algebras may be different from the ultraproduct of the π-characters of the factors.
Eric van Douwen (1981)
Fundamenta Mathematicae
Similarity:
Stanislav Krajči, Peter Vojtáš (1995)
Acta Universitatis Carolinae. Mathematica et Physica
Similarity:
Bohuslav Balcar, Petr Štěpánek (1977)
Fundamenta Mathematicae
Similarity:
R. Bonnet (1976)
Annales scientifiques de l'Université de Clermont. Mathématiques
Similarity:
H. Mildenberg (1993)
Fundamenta Mathematicae
Similarity:
Using ♢ , we construct a rigid atomless Boolean algebra that has no uncountable antichain and that admits the elimination of the Malitz quantifier .
Aleksander Błaszczyk, Andrzej Kucharski, Sławomir Turek (2014)
Open Mathematics
Similarity:
The aim of this paper is to show that every infinite Boolean algebra which admits a countable minimally acting group contains a dense projective subalgebra.