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Top Questions
56
votes
What are the benefits of viewing a sheaf from the "espace étalé" perspective?
ag.algebraic-geometry
sheaf-theory
ct.category-theory
asked May 7, 2012 at 21:01
mathoverflow.net
50
votes
What is the purpose of the flat/fppf/fpqc topologies?
ag.algebraic-geometry
grothendieck-topology
asked Jan 29, 2015 at 10:33
mathoverflow.net
32
votes
Is there a nice explanation for this curious fact about cyclic subgroups?
nt.number-theory
gr.group-theory
finite-groups
abelian-groups
p-groups
asked Jun 3, 2016 at 9:43
mathoverflow.net
21
votes
How many ways can I factor a matrix (over $\mathbb{Z}$)?
matrices
algebraic-groups
arithmetic-groups
asked Mar 29, 2016 at 14:01
mathoverflow.net
17
votes
How do modular forms of half-integral weight relate to the (quasi-modular) Eisenstein series?
modular-forms
theta-function
eisenstein-series
quasimodular-forms
half-integral-weight
asked Sep 8, 2010 at 18:28
mathoverflow.net
16
votes
Can one determine the dimension of a manifold given its 1-skeleton?
gn.general-topology
manifolds
simplicial-complexes
triangulations
asked Jan 6, 2019 at 19:31
mathoverflow.net
15
votes
How many sporadic simple groups are there, really?
gr.group-theory
finite-groups
sporadic-groups
asked Dec 10, 2013 at 18:02
mathoverflow.net
14
votes
Am I missing something about this notion of Mirror Symmetry for abelian varieties?
ag.algebraic-geometry
elliptic-curves
abelian-varieties
k3-surfaces
mirror-symmetry
asked Dec 1, 2014 at 12:48
mathoverflow.net
13
votes
What relations exist among (quasi-) modular forms of different levels?
modular-forms
nt.number-theory
asked Mar 22, 2011 at 22:39
mathoverflow.net
13
votes
Why isn't the orbifold cohomology of $pt/G$ equal to the cohomology of $BG$?
group-cohomology
orbifolds
classifying-spaces
asked Mar 3, 2011 at 0:02
mathoverflow.net
1
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Top Answers
65
Is there a domain "larger" than (i.e., a supserset of) the complex number domain?
math.stackexchange.com
58
Intuition behind normal subgroups
math.stackexchange.com
34
What's the sum of all the positive integral divisors of $540$?
math.stackexchange.com
34
Prove that the additive groups $\mathbb{Z}$ and $\mathbb{Q}$ are not isomorphic.
math.stackexchange.com
18
de Rham vs Dolbeault Cohomology
mathoverflow.net
15
Is every algebraic $K3$ surface a quartic surface?
mathoverflow.net
13
Complex torus, C^n/Λ versus (C*)^n
mathoverflow.net
12
Elliptic curves on abelian surface
mathoverflow.net
12
What recent discoveries have amateur mathematicians made?
mathoverflow.net
11
Examples of "Unusual" Classifications
mathoverflow.net
11
Understanding the definition of the quotient stack $[X/G]$
mathoverflow.net
9
Identifying the generating function $ G(a,z) = \sum_{n=0}^{\infty} a^n z^{(n+1)(n+2)/2}. $
mathoverflow.net
9
Sum $\frac{1}{1\times2}+\frac{1}{1\times3}+\frac{1}{2\times5}+\frac{1}{3\times8}+\cdots$
math.stackexchange.com
9
Existence of Homomorphism so that Diagram Commutes
math.stackexchange.com
8
show that $\frac{1}{F_{1}}+\frac{2}{F_{2}}+\cdots+\frac{n}{F_{n}}<13$
math.stackexchange.com
8
What is the meaning of non-Hausdorff spaces in algebraic geometry
mathoverflow.net
8
Blackboard rendering of math fonts
mathoverflow.net
8
Given a normal subgroup N⊆G, when does G contain a subgroup isomorphic to G/N?
mathoverflow.net
7
What exactly is a dimension?
math.stackexchange.com
7
Examples for Stone–Čech compactification
math.stackexchange.com
7
Examples in mirror symmetry that can be understood.
mathoverflow.net
7
Triviality of finite fiber bundles
mathoverflow.net
7
101102103104105106..............149150? What is the remainder when divided by 9?
math.stackexchange.com
7
Integral element in $\mathbb{Q}(\sqrt{2})$ over $\mathbb{Z}$ has form $m+n\sqrt{2}$
math.stackexchange.com
6
What is a branched Riemann surface with cuts?
mathoverflow.net
6
How do I evaluate $\int \frac{\mathrm{d}x}{e^x + 1} $?
math.stackexchange.com
6
Trivial Fundamental Group Notation (1 or 0)
math.stackexchange.com
5
Meaning of $g_d^r$ in algebraic geometry
mathoverflow.net
5
When do homology groups have torsion?
math.stackexchange.com
5
$\psi$ class in $\overline{M}_{0,n}$
mathoverflow.net
1
2
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