List questions from schemes

Published on 10 Apr 2026 - 4:04

413

Views

Map from X to $\mathbb P^1_k$ of degree $3$ with $X$ curve of genus $3$.

Published on 02 Feb 2022 - 12:37

71

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Constants of universal derivation on an $R$-algebra $A$ under localization ($d: S^{-1}A \to S^{-1}\Omega_{A/R}$)

Published on 25 Mar 2026 - 15:42

185

Views

Classification of coherent sheaves on $\Bbb P^1$ with a doubled point (nonseparated)

Published on 13 Apr 2026 - 2:33

172

Views

Question about a proof that all étale morphisms are locally standard étale

Published on 11 Apr 2026 - 6:15

352

Views

Quasi-projective A-schemes are locally of finite type over A, The Rising Sea, Ex.5.3.D

Published on 28 Mar 2026 - 21:06

99

Views

Flatness of a morphism for an infinitesimal deformation

Published on 10 Apr 2026 - 7:02

192

Views

Defining morphism of sheaves

Published on 12 Apr 2026 - 17:15

49

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Preimage of a proper morphism

Published on 26 Mar 2026 - 13:50

106

Views

Is there a way to prove that $\mathbb P^n \to \operatorname{Spec} \mathbb Z$ is universally closed without the valuative criterion?

Published on 12 Apr 2026 - 11:59

42

Views

Equivalence between connections on $\mathcal{E}$ and $\mathcal{P}^1$-linear isomorphisms that induce the identity modulo $\Omega^1_{X|S}$

Published on 12 Apr 2026 - 8:37

239

Views

preimages of morphisms of schemes

Published on 09 Apr 2026 - 14:19

394

Views

Two definitions of quasi-separated morphisms which may not be equivalent?

Published on 10 Apr 2026 - 21:06

433

Views

Quasi-compactness is a property of morphisms of schemes stable under base change

Published on 13 Apr 2026 - 16:08

404

Views

Set of points where stalk is integral domain is open

Published on 13 Apr 2026 - 18:38

List Question

Torsion at base change of group schemes

Map from X to $\mathbb P^1_k$ of degree $3$ with $X$ curve of genus $3$.

Constants of universal derivation on an $R$-algebra $A$ under localization ($d: S^{-1}A \to S^{-1}\Omega_{A/R}$)

Classification of coherent sheaves on $\Bbb P^1$ with a doubled point (nonseparated)

Question about a proof that all étale morphisms are locally standard étale

Quasi-projective A-schemes are locally of finite type over A, The Rising Sea, Ex.5.3.D

Flatness of a morphism for an infinitesimal deformation

Defining morphism of sheaves

Preimage of a proper morphism

Is there a way to prove that $\mathbb P^n \to \operatorname{Spec} \mathbb Z$ is universally closed without the valuative criterion?

Equivalence between connections on $\mathcal{E}$ and $\mathcal{P}^1$-linear isomorphisms that induce the identity modulo $\Omega^1_{X|S}$

preimages of morphisms of schemes

Two definitions of quasi-separated morphisms which may not be equivalent?

Quasi-compactness is a property of morphisms of schemes stable under base change

Set of points where stalk is integral domain is open

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