The independence of the axiom of choice from the Boolean prime ideal theorem
J. Halperin (1964)
Fundamenta Mathematicae
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J. Halperin (1964)
Fundamenta Mathematicae
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Erik Ellentuck (1968)
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Leon Henkin (1955)
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Saharon Shelah (1996)
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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.
J. Łoś, Czesław Ryll-Nardzewski (1955)
Fundamenta Mathematicae
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Eric van Douwen (1981)
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J. Baumgartner, A. Hajnal (1973)
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M. Stone (1945)
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B. R. Salinas, F. Bombal (1973)
Collectanea Mathematica
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R. Frankiewicz, Paweł Zbierski (1991)
Fundamenta Mathematicae
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