Szegoö-type properties in a non-commutative case
Wacław Szymański (1977)
Annales Polonici Mathematici
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Wacław Szymański (1977)
Annales Polonici Mathematici
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Štefan Schwarz (1956)
Czechoslovak Mathematical Journal
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Michael Voit (1988)
Mathematische Zeitschrift
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Rechnoi, V. (2005)
Lobachevskii Journal of Mathematics
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Peter Guthrie Tait
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Laura Paladino (2011)
Acta Arithmetica
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Vladimir Volenec (1987)
Stochastica
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A laterally commutative heap can be defined on a given set iff there is the structure of a TST-space on this set.
Ivan Chajda (2007)
Discussiones Mathematicae - General Algebra and Applications
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The concept of a commutative directoid was introduced by J. Ježek and R. Quackenbush in 1990. We complete this algebra with involutions in its sections and show that it can be converted into a certain implication algebra. Asking several additional conditions, we show whether this directoid is sectionally complemented or whether the section is an NMV-algebra.
Dimca, Alexandru (2007)
Analele Ştiinţifice ale Universităţii “Ovidius" Constanţa. Seria: Matematică
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Mirella Manaresi (1988)
Banach Center Publications
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Saharon Shelah (2008)
Colloquium Mathematicae
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We show the consistency of the statement: "the set of regular cardinals which are the characters of ultrafilters on ω is not convex". We also deal with the set of π-characters of ultrafilters on ω.
V. I. Gryn, V. A. Ovsyannikov (1990)
Banach Center Publications
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