red_trumpet

Member for 7 years, 10 months
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Germany

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algebraic-geometry

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Answers

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Score Activity Newest

13

What is a simple definition of the pullback of a section?

Dec 28, 2019

8

Confusion on the definition of a complex structure

Sep 27, 2021

6

Proof of Serre Duality in Hartshorne

Jul 4, 2018

6

Subbundle of a pullback is not the pullback of a subbundle

Jun 7

5

Strengthening Ax-Grothendieck

Mar 6

Questions

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Score Activity Newest Views

9

Is the pull-back of the structure sheaf the structure sheaf?

Jan 18, 2019

9

Unexpected proof that $\alpha!$ divides $k!$ if $\alpha_1 + \dots + \alpha_n = k$.

Mar 4, 2019

9

Good argument that $\Omega_{X/k} = 0$ implies that $X$ is finite.

Jun 28, 2021

7

What exactly is a universal central extension?

May 24

7

Hartshorne Exercise III 3.2: $X$ is affine iff every component is affine

Apr 11, 2019

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algebraic-geometry

209

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247

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complex-geometry

58

Score

79

posts

commutative-algebra

35

Score

49

posts

abstract-algebra

34

Score

43

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schemes

26

Score

32

posts

Reputation

+10

Why conformal map of $\mathbb R^n$ taking $H^n$ onto $H^n$ will take $\partial H^n$ into itself?

+10

If $f: S^1 \times (0,1) \to S^1 \times (0,1)$ is compatible with $S^1 \times (0,1) \to (0,1)$, can a homotopy also be chosen compatible?

+10

The intersection of projective varieties is never empty unless for dimensional reasons

+10

Self-intersection of diagonal vs. alternating sum of Betti numbers.

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Jul 24, 2022
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