Embedding of Boolean algebras in Ρ(ω)/fin
J. Baumgartner, R. Frankiewicz, P. Zbierski (1990)
Fundamenta Mathematicae
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J. Baumgartner, R. Frankiewicz, P. Zbierski (1990)
Fundamenta Mathematicae
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R. Frankiewicz, Paweł Zbierski (1990)
Fundamenta Mathematicae
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Lev Bukovský (1973)
Fundamenta Mathematicae
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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.
Ryszard Frankiewicz (1985)
Fundamenta Mathematicae
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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 .
Sabine Koppelberg (1988)
Acta Universitatis Carolinae. Mathematica et Physica
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Bohuslav Balcar, Petr Štěpánek (1977)
Fundamenta Mathematicae
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Eric van Douwen (1981)
Fundamenta Mathematicae
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