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# Questions

2
7
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434
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### Non-isomorphic groups with isomorphic nth powers (and similarly in other categories)

may 3 10 at 3:54 Victor Protsak 7,75113044

1
7
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2
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612
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### Space whose product with paracompact space is paracompact

jun 23 11 at 13:15 Stephen S 784179

2
7
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1
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266
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### Finding a subnormal series with specified quotients and end group of specific depth (defect)

jan 22 12 at 0:56 Vipul Naik 4,8651342

4
7
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1
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210
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### Does every retraction of free groups arise from projection to a subset of a freely generating set?

may 25 10 at 23:25 HW 10.1k12366

1
6
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3
answers
536
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### Brauer’s permutation lemma — extending to some other finite groups?

sep 12 at 20:29 Vipul Naik 4,8651342

4
6
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3
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1k
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### congruent to 1 mod p

jun 29 10 at 11:27 Gerry Myerson 15.7k14787

1
6
votes
2
answers
677
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### Spheres over rational numbers and other fields

feb 22 10 at 19:45 Bjorn Poonen 14.2k24775

1
6
votes
3
answers
441
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### Braid group analogue for signed symmetric group?

mar 30 11 at 17:50 Adrien 2,1001712

6
votes
1
answer
154
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### What are the necessary and sufficient conditions for GL(n,Z/p^lZ) to be isomorphic to GL(n,F_p[t]/t^l)?

sep 12 at 16:01 Amritanshu Prasad 1,873615

5
6
votes
1
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209
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### Normal subgroup that is invariant under powering such that the quotient group is not invariant

feb 15 at 1:45 Denis Osin 1,706614