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15
100
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Definition of a compact topos

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#category-theory #definition #compactness #sheaf-theory #topos-theory
87
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Is the sheaf cohomology only a sheaf for flabby sheaves?

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#algebraic-topology #sheaf-theory #sheaf-cohomology #derived-functors #grothendieck-topologies
813
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$\phi$ is a monomorphism in the category of presheaves of sets iff it is injective as a morphism of presheaves

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#algebraic-geometry #category-theory #sheaf-theory
170
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Is the sheafification of a presheaf of graded modules graded?

Published on
#algebraic-geometry #sheaf-theory
151
Views

Analyzing the affine scheme Spec $K[x]_{(x)}$

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#algebraic-geometry #sheaf-theory #schemes #localization #affine-schemes
320
Views

Clarify on Mumford's Red Book

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#algebraic-geometry #sheaf-theory
167
Views

Sheafification in the derived category.

Published on
#homotopy-theory #sheaf-theory #sheaf-cohomology #derived-functors #higher-category-theory
655
Views

Mayer-Vietoris Sequence for Cohomology with Supports

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#algebraic-geometry #homology-cohomology #sheaf-theory #sheaf-cohomology
178
Views

Gluing morphisms of sheaves on the big zariski site

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#algebraic-geometry #category-theory #sheaf-theory #schemes #representable-functor
732
Views

The global section of direct sum of twisted sheaves

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#algebraic-geometry #sheaf-theory
47
Views

Correspondance between sheaves on Étale spaces and natural transformations of sheaves.

Published on
#general-topology #sheaf-theory
366
Views

Dualizing complex of Cohen-Macaulay variety

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#algebraic-geometry #sheaf-theory #schemes #derived-functors #cohen-macaulay
262
Views

Are Bundles of vector spaces equivalent to sheaves?

Published on
#sheaf-theory #vector-bundles
665
Views

Showing that compatible germs are the image of a section.

Published on
#general-topology #algebraic-geometry #sheaf-theory
369
Views

Proposition IV.2.3 in Hartshorne

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#algebraic-geometry #sheaf-theory

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