Atoms and Generators in Boolean -Algebras
Lev Bukovský, Martin Gavalec (1972)
Matematický časopis
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Lev Bukovský, Martin Gavalec (1972)
Matematický časopis
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H. Mildenberg (1993)
Fundamenta Mathematicae
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Using ♢ , we construct a rigid atomless Boolean algebra that has no uncountable antichain and that admits the elimination of the Malitz quantifier .
Věra Trnková (1986)
Commentationes Mathematicae Universitatis Carolinae
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Roman Sikorski (1961)
Colloquium Mathematicum
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Saharon Shelah (1996)
Fundamenta Mathematicae
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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.