173

Answers
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5
An example of a beautiful proof that would be accessible at the high school level?
9
Blackbox Theorems
6
Proofs of the uncountability of the reals.
11
functions satisfying “one-one iff onto”
1
Good books in Modular Representation Theory
7
Non-vanishing of group cohomology in sufficiently high degree
4
Why chain homotopy when there is no topology in the background?
7
Characterization of the transfer map in group theory
4
“Lie algebra” for a general group ?
18
Is strong approximation difficult?
4
The number of conjugacy classes and the order of the group
4
cohomology of BG, G compact Lie group
7
Mistake in Wikipedia Entry “Coalgebra”
13
Subgroups of GL(2,q)
4
Good uses of Siegel zeros?
3
Can epi/mono for natural transformations be checked pointwise?
11
Which topological spaces are (topological) groups?
6
Finite subgroup of $Gl(n,\mathbb Z)$ and congruences (2)
8
What is the “ray” in ray class group?
7
Why doesn’t this group have a name?
4
How to work with co-multiplication?
2
Why are ring actions much harder to find than group actions?
1
Closed-form for modified formal power series
7
A map inducing isomorphisms on homology but not on homotopy
7
determinants and polynomials in matrices
7
Lists of small groups
13
When does a homomorphism factor through a free group?
23
Non-split extension of the rationals by the integers
0
Is this long sequence of Hom’s exact ?
7
Applications of Zariski topology outside alg. geometry
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