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How to understand group action especially Galois action on a scheme?

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#algebraic-geometry #group-actions #schemes #affine-varieties #projective-varieties
131
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An exact sequence for coherent sheaves on $\mathbf{P}^n_k$

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#algebraic-geometry #schemes #projective-geometry #coherent-sheaves #projective-schemes
180
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What is the definition of a variety in Mumford's red book?

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#algebraic-geometry #reference-request #definition #schemes
326
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The stalk $O_{X,x}$ is an integral domain implies $x$ is in the closure of only one associated point

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#algebraic-geometry #schemes #affine-schemes
254
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Fiber product of schemes

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#algebraic-geometry #schemes
372
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Open subscheme of Noetherian integral scheme is integral?

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#algebraic-geometry #sheaf-theory #schemes #affine-schemes
839
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When does the Picard group embeds inside the divisor class group?

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#algebraic-geometry #schemes #divisors-algebraic-geometry #line-bundles
110
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No-nonsense reference on classical Dieudonné theory

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#number-theory #algebraic-geometry #reference-request #schemes
99
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When is $(\mathbf{Z}/n\mathbf{Z})_R$ self-dual?

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#number-theory #algebraic-geometry #schemes #hopf-algebras #group-schemes
63
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Trying to prove the equivalence of two notions of a tangent space of a scheme

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#algebraic-geometry #schemes #affine-schemes
2.2k
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Every irreducible closed has a generic point

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#algebraic-geometry #schemes #affine-schemes
221
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Hom of sheaf of modules (Hartshorne Ex. II.5.3)

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#algebraic-geometry #schemes #affine-schemes
61
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Are these two functors same (isomorphic)?

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#schemes #functors #representable-functor
617
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Irreducibility of $X\times_k\overline{k}$ (Hartshorne 3.15 (a))

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#algebraic-geometry #sheaf-theory #schemes #affine-schemes
173
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Stalks at points in the fibre of scheme morphisms

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#algebraic-geometry #schemes

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