List questions from projective-schemes

Published on 25 Mar 2026 - 9:27

132

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$X$ a $k$-variety and given a DVR $R$, $Spec(R) \rightarrow X$ maps the closed point of $R$ to a closed point of $X$

Published on 25 Mar 2026 - 9:29

37

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Cech - cocycle on the projective line over $\mathbb{F}_2$

Published on 11 May 2026 - 0:43

409

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Twisted sheaves in Hartshorne

Published on 11 May 2026 - 0:27

64

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For any ideal $I$, $V_+(I)=V_+(J)$ for a specific homogeneous $J$

Published on 25 Mar 2026 - 9:32

240

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Separating Points and Tangent Vectors (real curves)

Published on 10 May 2026 - 18:25

197

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The function field of the projective scheme $\mathbb{P}^{r}_{k}$.

Published on 25 Mar 2026 - 9:25

125

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Hilbert polynomial of the blow-up of a projection

Published on 10 May 2026 - 17:00

102

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When is $\operatorname{Proj}k[x,y,z]/(x^n＋y^n＋z^n)$ is a regular scheme?

Published on 25 Mar 2026 - 9:29

132

Views

An exact sequence for coherent sheaves on $\mathbf{P}^n_k$

Published on 11 May 2026 - 3:27

317

Views

projective space minus a closed point

Published on 10 May 2026 - 22:32

202

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Existence of scheme quotient

Published on 10 May 2026 - 18:26

132

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The $\mathrm{Proj}$-construction and inverse limits

Published on 14 Apr 2026 - 20:23

1.7k

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How to complete Vakil's proof that the composition of projective morphisms are projective when the target is quasicompact?

Published on 13 Apr 2026 - 7:01

166

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How can I find the presentation of the hyperplane in a linear system?

Published on 12 Apr 2026 - 1:17

List Question

Question about Theorem 1 Chapter II.8 from Mumford's red book

$X$ a $k$-variety and given a DVR $R$, $Spec(R) \rightarrow X$ maps the closed point of $R$ to a closed point of $X$

Cech - cocycle on the projective line over $\mathbb{F}_2$

Twisted sheaves in Hartshorne

For any ideal $I$, $V_+(I)=V_+(J)$ for a specific homogeneous $J$

Separating Points and Tangent Vectors (real curves)

The function field of the projective scheme $\mathbb{P}^{r}_{k}$.

Hilbert polynomial of the blow-up of a projection

When is $\operatorname{Proj}k[x,y,z]/(x^n＋y^n＋z^n)$ is a regular scheme?

An exact sequence for coherent sheaves on $\mathbf{P}^n_k$

projective space minus a closed point

Existence of scheme quotient

The $\mathrm{Proj}$-construction and inverse limits

How to complete Vakil's proof that the composition of projective morphisms are projective when the target is quasicompact?

How can I find the presentation of the hyperplane in a linear system?

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