welk sheaf - ορισμός. Τι είναι το welk sheaf
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Τι (ποιος) είναι welk sheaf - ορισμός

MATHEMATICAL OBJECT IN SHEAF COHOMOLOGY
Flasque resolution; Flabby sheaf; Flabby resolution; Soft sheaf; Fine sheaf; Acyclic sheaf; Flasque sheaf; Flasque sheaves

Tanya Falan Welk-Roberts         
AMERICAN SINGER
Tanya Falan; Tanya Falan Welk
Tanya Falan Welk (born May 4, 1948) is an American singer who appeared on The Lawrence Welk Show from 1968 to 1977.
sheaf         
WIKIMEDIA DISAMBIGUATION PAGE
Sheaf (disambiguation)
(sheaves)
1.
A sheaf of papers is a number of them held or fastened together.
He took out a sheaf of papers and leafed through them.
N-COUNT: usu N of n
2.
A sheaf of corn or wheat is a number of corn or wheat plants that have been cut down and tied together.
N-COUNT
sheaf         
WIKIMEDIA DISAMBIGUATION PAGE
Sheaf (disambiguation)
¦ noun (plural sheaves)
1. a bundle of grain stalks laid lengthways and tied together after reaping.
2. a bundle of objects, especially papers.
¦ verb bundle into sheaves.
Origin
OE sceaf, of Gmc origin; related to shove.

Βικιπαίδεια

Injective sheaf

In mathematics, injective sheaves of abelian groups are used to construct the resolutions needed to define sheaf cohomology (and other derived functors, such as sheaf Ext).

There is a further group of related concepts applied to sheaves: flabby (flasque in French), fine, soft (mou in French), acyclic. In the history of the subject they were introduced before the 1957 "Tohoku paper" of Alexander Grothendieck, which showed that the abelian category notion of injective object sufficed to found the theory. The other classes of sheaves are historically older notions. The abstract framework for defining cohomology and derived functors does not need them. However, in most concrete situations, resolutions by acyclic sheaves are often easier to construct. Acyclic sheaves therefore serve for computational purposes, for example the Leray spectral sequence.