- projective cover
- проективное покрытие* * *проективное покрытие
English-russian biological dictionary. 2013.
projective cover
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Projective cover — In category theory, a projective cover of an object X is in a sense the best approximation of X by a projective object P . Projective covers are the dual of injective envelopes. Definition Let mathcal{C} be a category and X an object in… … Wikipedia
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Fake projective plane — For Freedman s example of a non smoothable manifold with the same homotopy type as the complex projective plane, see 4 manifold. In mathematics, a fake projective plane (or Mumford surface) is one of the 50 complex algebraic surfaces that have… … Wikipedia
Cycle double cover — Unsolved problems in mathematics Does every bridgeless graph have a multiset of cycles covering every edge exactly twice? … Wikipedia
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Semiperfect ring — In abstract algebra, a semiperfect ring is a ring over which every finitely generated left module has a projective cover. This property is left right symmetric. Definition Let R be ring. Then R is semiperfect if any of the following equivalent… … Wikipedia
Schur's lemma — In mathematics, Schur s lemma is an elementary but extremely useful statement in representation theory of groups and algebras. In the group case it says that that if M and N are two finite dimensional irreducible representations of a group G and… … Wikipedia
Flora Australiens — Spinifex (Triodia) bedeckt große Gebiete des ariden Zentralaustralien … Deutsch Wikipedia
