240

Answers
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60
Examples of interesting false proofs
57
When should a supervisor be a co-author?
39
Mathematically mature way to think about Mayer–Vietoris
38
If you went into a coma now and woke in twenty years time what would be your first post on MO?
37
what mistakes did the Italian algebraic geometers actually make?
32
A Book You Would Like to Write
27
Profinite groups as étale fundamental groups
25
An algebraic vector bundle is trivialized by open sets. How many does one need?
23
$\mathbb{P}^n$ is simply connected
23
Does a “composite field” always exist?
21
Are non-algebraic stacks useful in algebraic geometry?
21
Does S^6 have the structure of an algebraic variety?
21
isomorphism of abelian varieties
21
When and how is it appropriate for an undergraduate to email a professor out of the blue?
19
Categories First Or Categories Last In Basic Algebra?
19
Varieties as an introduction to algebraic geometry / How do professional algebraic geometers think about varieties
18
Major mathematical advances past age fifty
18
Vector bundles on $\mathbb{P}^1\times\mathbb{P}^1$
18
How to refer to a theorem that you have shown to be wrong
17
Kunneth formula for sheaf cohomology of varieties
17
In what sense is the étale topology equivalent to the Euclidean topology?
16
To what extent is it true that “number theory = mathematics”?
16
Splitting principle for holomorphic vector bundles
15
Smooth variety contained in another smooth variety
15
Etale cohomology with coefficients in the integers
15
Are all Galois cohomology groups also étale cohomology groups?
15
A question regarding a claim of V. I. Arnold
15
Can curves differentiate vector bundles on P^2?
14
Qcoh(-) algebraic stack?
14
non-locally trivial A^n bundles
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