Question

Existence of a $\mathbb{Q}$-rational point from the existence of an $\mathbb{F}_p$-rational point for all $p$?

score 61 · Answer 1 · 2026-04-17 15:06:45

61

Views

Existence of a $\mathbb{Q}$-rational point from the existence of an $\mathbb{F}_p$-rational point for all $p$?

Published on 17 Apr 2026 - 15:06

score 81 · Answer 2 · 2026-04-15 15:59:03

81

Views

Intersection of hyperplane in singular Point

Published on 15 Apr 2026 - 15:59

score 860 · Answer 3 · 2026-04-14 08:05:07

860

Views

Proving a bijective morphism of projective varieties is not an isomorphism

Published on 14 Apr 2026 - 8:05

score 81 · Answer 4 · 2026-04-12 21:32:36

81

Views

Closed immersion property

Published on 12 Apr 2026 - 21:32

score 543 · Answer 5 · 2026-04-17 08:45:57

543

Views

Is there a notion of "localization morphism" of schemes?

Published on 17 Apr 2026 - 8:45

score 34 · Answer 6 · 2026-04-16 00:32:05

34

Views

If $X$ is a affine variety and $Y$ is a quasiaffine variety of $X$, then $I(X)=I(Y)$?

Published on 16 Apr 2026 - 0:32

score 103 · Answer 7 · 2026-04-13 14:40:08

At a non-singular point of a locally factorial variety, prime divisors are locally principal. But what about Weil divisors?

score 46 · Answer 8 · 2026-04-16 22:26:25

46

Views

k-basis of $\Gamma(X,\mathscr{F})$ generates the sheaf $\mathscr{F}$?

Published on 16 Apr 2026 - 22:26

score 105 · Answer 9 · 2026-03-25 07:50:09

105

Views

Representability criterion for schemes

Published on 25 Mar 2026 - 7:50

score 115 · Answer 10 · 2026-04-11 13:30:33

115

Views

Singularity of a curve in higher dimensions

Published on 11 Apr 2026 - 13:30

score 43 · Answer 11 · 2026-04-13 07:48:13

43

Views

A basic question about algebraic groups on inversion being a morphism

Published on 13 Apr 2026 - 7:48

score 406 · Answer 12 · 2026-03-25 06:04:29

406

Views

Does the blow-up induce an isomorphism in top cohomology (real coefficients)?

Published on 25 Mar 2026 - 6:04

score 413 · Answer 13 · 2026-04-11 18:13:41

413

Views

Flabby sheaf is "obviously" soft?

Published on 11 Apr 2026 - 18:13

score 73 · Answer 14 · 2026-04-13 07:06:35

73

Views

Basic property of schemes?

Published on 13 Apr 2026 - 7:06

score 170 · Answer 15 · 2026-04-20 08:30:38

170

Views

What, exactly, is Schubert's symbolic calculus?

Published on 20 Apr 2026 - 8:30

List Question

Existence of a $\mathbb{Q}$-rational point from the existence of an $\mathbb{F}_p$-rational point for all $p$?

Intersection of hyperplane in singular Point

Proving a bijective morphism of projective varieties is not an isomorphism

Closed immersion property

Is there a notion of "localization morphism" of schemes?

If $X$ is a affine variety and $Y$ is a quasiaffine variety of $X$, then $I(X)=I(Y)$?

At a non-singular point of a locally factorial variety, prime divisors are locally principal. But what about Weil divisors?

k-basis of $\Gamma(X,\mathscr{F})$ generates the sheaf $\mathscr{F}$?

Representability criterion for schemes

Singularity of a curve in higher dimensions

A basic question about algebraic groups on inversion being a morphism

Does the blow-up induce an isomorphism in top cohomology (real coefficients)?

Flabby sheaf is "obviously" soft?

Basic property of schemes?

What, exactly, is Schubert's symbolic calculus?

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