Some leakage problems for ideal incompressible fluid motion in domains with edges
W. M. Zajaczkowski (1987)
Banach Center Publications
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W. M. Zajaczkowski (1987)
Banach Center Publications
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Piotr Kalemba (2015)
Open Mathematics
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The ideal (v0) is known in the literature and is naturally linked to the structure [ω]ω. We consider some natural counterpart of the ideal (v0) related in an analogous way to the structure Dense(ℚ) and investigate its combinatorial properties. By the use of the notion of ideal type we prove that under CH this ideal is isomorphic to (v0).
Scheja, Günter, Storch, Uwe (1996)
Beiträge zur Algebra und Geometrie
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Rosłanowski, Andrzej, Shelah, Saharon (1997)
Journal of Applied Analysis
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Xiao Long Xin, Rajab Ali Borzooei, Young Bae Jun (2019)
Bulletin of the Section of Logic
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The notion of positive implicative soju ideal in BCK-algebra is introduced, and several properties are investigated. Relations between soju ideal and positive implicative soju ideal are considered, and characterizations of positive implicative soju ideal are established. Finally, extension property for positive implicative soju ideal is constructed.
Azzouz Cherrabi, Abderrahim Miri (1999)
Extracta Mathematicae
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Miroslav Repický (1987)
Acta Universitatis Carolinae. Mathematica et Physica
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Hiroshi Isozaki (1986)
Journées équations aux dérivées partielles
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Rafał Filipów, Nikodem Mrożek, Ireneusz Recław, Piotr Szuca (2013)
Commentationes Mathematicae Universitatis Carolinae
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We show that the ideal of nowhere dense subsets of rationals cannot be extended to an analytic P-ideal, ideal nor maximal P-ideal. We also consider a problem of extendability to a non-meager P-ideals (in particular, to maximal P-ideals).