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Score Newest
question
28
morphisms representable by algebraic spaces vs morphisms representable by schemes
Sep 13, 2016
question
22
Is $\widehat{\mathbb{Z}}[[t]]\cong\widehat{\mathbb{Z}}[[\widehat{\mathbb{Z}}]]$?
Feb 6, 2017
question
22
For which $n$ is it true that all surjections $SL_2(\mathbb{Z})\rightarrow SL_2(\mathbb{Z}/n\mathbb{Z})$ have kernel $\Gamma(n)$?
Sep 27, 2016
question
16
How should I think about the module of coinvariants of a $G$-module?
Oct 11, 2018
question
15
Is every normal subgroup of $SL_2(\mathbb{Z}/n)$ also normal inside $GL_2(\mathbb{Z}/n)$?
Jan 14, 2017
question
14
When is the inverse image of the structure sheaf the structure sheaf?
Nov 23, 2017
question
14
Invariants of matrices (by simultaneous $\mathrm{GL}_n$ conjugation) over arbitrary rings
Sep 6, 2021
question
13
Difference between the completed group algebra and the profinite completion of a group ring
Feb 6, 2017
question
12
are the congruence subgroups $\Gamma(n)$ characteristic inside $\mathrm{SL}_2(\mathbb{Z})$?
Sep 27, 2016
question
11
Are there open subgroups of $SL_2(\widehat{\mathbb{Z}})$ which are $GL_2(\widehat{\mathbb{Z}})$-conjugate, but not $SL_2$-conjugate?
Aug 18, 2017
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6
Can a connected finite etale cover of a curve over a DVR have a disconnected special fiber?
6
Does Hilbert's theorem 90 hold for local rings?
5
In a finite field, can all of the $\mathbb{F}_p$-translates of a square also be square?
5
Prime divisors of the conductor of a primitive element for a number field

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