List questions from schemes

Published on 25 Mar 2026 - 20:19

211

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Examples of proper, non normal schemes

Published on 27 Mar 2026 - 10:37

277

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Locally ringed spaces and varieties

Published on 26 Mar 2026 - 21:08

26

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Algebraic subgroups and Hopf ideals

Published on 29 Mar 2026 - 14:28

2.4k

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Why introduce the $p$-adic numbers?

Published on 25 Mar 2026 - 15:24

145

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$V(X_1,\ldots,X_n)$ has empty interior.

Published on 20 May 2017 - 8:27

201

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Intersecting $\mathbb{Q}$-Cartier divisors on a singular variety (Cone)

Published on 26 Mar 2026 - 13:57

54

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Do flat morphism of schemes induce injection on cotangents?

Published on 25 Mar 2026 - 7:43

256

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What is the obstruction?

Published on 25 Mar 2026 - 20:12

118

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For a scheme $X$, how to formally proof that $\mathcal{O}_X(X)$ are the global functions?

Published on 22 May 2017 - 12:26

134

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Do two functions coinciding on an open set of an irreducible scheme coincide?

Published on 23 May 2017 - 20:36

1.2k

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Isomorphism of rings induces isomorphism of affine schemes

Published on 27 Mar 2026 - 11:48

1.7k

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What does Liu mean by "topological open/closed immersion" in his book "Algebraic Geometry and Arithmetic Curves"?

Published on 29 May 2017 - 17:38

885

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Structure sheaf of support of coherent sheaf

Published on 26 Mar 2026 - 13:01

338

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disjoint union of projective morphisms is projective?

Published on 30 May 2017 - 16:10

List Question

What is an explicit example of a lifting in the valuative criterion for properness?

Examples of proper, non normal schemes

Locally ringed spaces and varieties

Algebraic subgroups and Hopf ideals

Why introduce the $p$-adic numbers?

$V(X_1,\ldots,X_n)$ has empty interior.

Intersecting $\mathbb{Q}$-Cartier divisors on a singular variety (Cone)

Do flat morphism of schemes induce injection on cotangents?

What is the obstruction?

For a scheme $X$, how to formally proof that $\mathcal{O}_X(X)$ are the global functions?

Do two functions coinciding on an open set of an irreducible scheme coincide?

Isomorphism of rings induces isomorphism of affine schemes

What does Liu mean by "topological open/closed immersion" in his book "Algebraic Geometry and Arithmetic Curves"?

Structure sheaf of support of coherent sheaf

disjoint union of projective morphisms is projective?

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