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Angelo's user avatar
Angelo's user avatar
Angelo
  • Member for 13 years, 2 months
  • Last seen this week
111 votes

what mistakes did the Italian algebraic geometers actually make?

108 votes

Examples of interesting false proofs

101 votes

When should a supervisor be a co-author?

64 votes
Accepted

Mathematically mature way to think about Mayer–Vietoris

43 votes

If you went into a coma now and woke in twenty years time what would be your first post on MO?

41 votes

A book you would like to write

37 votes

How to refer to a theorem that you have shown to be wrong

33 votes
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Profinite groups as étale fundamental groups

33 votes
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In what sense is the étale topology equivalent to the Euclidean topology?

32 votes

$\mathbb{P}^n$ is simply connected

32 votes
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Kunneth formula for sheaf cohomology of varieties

31 votes
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An algebraic vector bundle is trivialized by open sets. How many does one need?

29 votes
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Does a "composite field" always exist?

28 votes

Are non-algebraic stacks useful in algebraic geometry?

27 votes
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Vector bundles on $\mathbb{P}^1\times\mathbb{P}^1$

26 votes

When and how is it appropriate for an undergraduate to email a professor out of the blue?

26 votes

Major mathematical advances past age fifty

25 votes

Are all Galois cohomology groups also étale cohomology groups?

25 votes
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Does S^6 have the structure of an algebraic variety?

25 votes
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Etale cohomology with coefficients in the integers

24 votes
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What are the prime ideals of k[[x,y]]?

24 votes

Categories First Or Categories Last In Basic Algebra?

21 votes

Varieties as an introduction to algebraic geometry / How do professional algebraic geometers think about varieties

21 votes
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Can curves differentiate vector bundles on P^2?

21 votes

A question regarding a claim of V. I. Arnold

20 votes
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isomorphism of abelian varieties

20 votes
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Splitting principle for holomorphic vector bundles

19 votes
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If a tensor product of modules is semi-simple, are the tensor factors semi-simple ?

19 votes
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Qcoh(-) algebraic stack?

18 votes
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Analytic vs. formal vs. étale singularities

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