Anton Geraschenko's user avatar
Anton Geraschenko's user avatar
Anton Geraschenko's user avatar
Anton Geraschenko
  • Member for 14 years, 6 months
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17 votes
Accepted

Sheaf description of $G$-bundles

17 votes
Accepted

Non-quasi separated morphisms

15 votes

Real-world applications of mathematics, by arxiv subject area?

15 votes

Quotients of Schemes by Free Group Actions

15 votes

Is it possible to dissect a disk into congruent pieces, so that a neighborhood of the origin is contained within a single piece?

14 votes
Accepted

Atiyah-MacDonald, exercise 2.11

13 votes
Accepted

Is a quotient of a reductive group reductive?

13 votes

LaTeX based document editors

13 votes

Isodiametric Inequality

12 votes

Learning about Lie groups

12 votes

Why is this not an algebraic space?

12 votes

Maps to projective space determined by a line bundle

12 votes
Accepted

Ways of formulating homological algebra without diagram chasing

11 votes
Accepted

Continuous bijective way of representing a line on a plane

11 votes
Accepted

Schemes do not form a stack in the etale topology?

11 votes

Sites which are stacks over themselves

10 votes

Does the fiber product of two normal varieties remain normal?

9 votes

What is an example of a presheaf P where P^+ is not a sheaf, only a separated presheaf?

9 votes

Are there elementary-school curricula that capture the joy of mathematics?

9 votes
Accepted

Prestacks and fibered categories

8 votes

Does finite mathematics need the axiom of infinity?

8 votes
Accepted

The etale site of a closed subscheme and its etale Grothendieck subtopology

7 votes
Accepted

Finite groups generated by pseudo-reflections

7 votes
Accepted

Is an affine "G-variety" with reductive stabilizers a toric variety?

7 votes

Are curves with `fractional points' uniquely determined by their residual gerbes?

7 votes

Is it alright for STD error bars to be below zero?

7 votes
Accepted

intuition about the "section after base-change" for flat descent and exactness of the Amitsur complex

7 votes
Accepted

Weakened conditions for étale + X implies faithfully flat.

6 votes

Why are non-singleton covering families often ignored?

6 votes

"Every scheme as a sheaf" references?