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Answers
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65
Examples where it's useful to know that a mathematical object belongs to some family of objects
Sep 1 '11 at 6:18
63
Can the fundamental group of any manifold be realized as the fund grp of a finite space?
Nov 10 '10 at 13:01
50
Structures that turn out to exhibit a symmetry even though their definition doesn't
Dec 14 '13 at 20:52
32
What does the term “yoga” mean in mathematics?
May 6 '11 at 2:28
31
Most memorable titles
Oct 31 '10 at 16:38
30
Can we have A={A} ?
Jul 25 '10 at 15:20
28
Is the moduli space of curves defined over the field with one element?
Jan 3 '12 at 3:57
27
Ring-theoretic characterization of open affines?
Apr 8 '10 at 21:49
24
Automorphism group of a scheme
Feb 10 '11 at 16:21
23
Is there a higher Grothendieck ring?
Aug 21 '14 at 7:37
23
how does one understand GRR? (Grothendieck Riemann Roch)
Apr 27 '11 at 10:18
23
Pseudonyms of famous mathematicians
Nov 7 '10 at 21:56
22
Applications of Grothendieck-Riemann-Roch?
Oct 27 '10 at 7:45
21
Example of an unnatural isomorphism
Aug 14 '13 at 9:03
20
Parodies of abstruse mathematical writing
Mar 14 '15 at 6:12
20
Number of curves over a finite field
Dec 9 '13 at 20:27
19
How should one understand orbifold fundamental groups?
Aug 30 '12 at 8:30
18
Certain signed sum over $S_n$
Jan 25 '15 at 21:29
18
Ring with three binary operations
Feb 5 '13 at 16:45
17
Cohomology of configuration space as a representation of the symmetric group
Sep 15 '15 at 7:38
17
“Surprising” categorical equivalences
Mar 6 '11 at 12:23
17
Teichmuller modular forms and number theory
Dec 12 '10 at 11:43
16
Is it true that if $M$ is injective then $S^{-1}M$ is also injective
Sep 8 '13 at 13:44
15
Count of full, binary trees with fixed number of leaves
Feb 25 '10 at 15:33
15
What is the intuition inertia orbifold (or stack)?
Feb 21 '13 at 15:30
14
Singularities of moduli spaces of curves
Jan 7 '14 at 8:46
14
Are all parametrizations via polynomials algebraic varieties?
Aug 31 '10 at 9:04
13
Is the Euler characteristic a birational invariant
May 25 '10 at 21:25
12
A spectral sequence for computing cohomology of a space from that of its strata
Mar 8 at 11:49
12
Framed version of braided monoidal category
Nov 12 '14 at 19:56
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