Mathematics
Sebastian Schoennenbeck's user avatar
Sebastian Schoennenbeck's user avatar
Sebastian Schoennenbeck's user avatar
Sebastian Schoennenbeck
  • Member for 12 years, 1 month
  • Last seen this week
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About

Postdoctoral researcher at RWTH Aachen focussing on (algorithmic) number theory.

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Top posts
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All Questions Answers
Score Newest
answer
11
Is this quotient ring finite?
Nov 10, 2017
answer
11
Every finite group is the Galois group of a field extension
Mar 18, 2015
question
10
Are two subgroups that contain a common element conjugate iff they are conjugate under the normalizer?
Feb 29, 2012
answer
9
Showing determinants using trace in a 2x2 matrix
Nov 1, 2011
answer
8
If $G$ is a group in which $(ab)^i = a^ib^i$ for two consecutive integers $i$, for all $a,b \in G$, can we conclude that $G$ is abelian?
Oct 10, 2017
answer
8
When does -1 have a squareroot in a finite field? (-1 as a quadratic residue)
Jul 28, 2014
answer
8
Let $K$ be a Sylow subgroup of a finite group $G$. Prove that if $x \in N(K)$ and the order of $x$ is a power of $p$, then $ x \in K$.
Apr 10, 2014
answer
7
The transpose of a permutation matrix is its inverse.
Jan 12, 2012
question
6
What is the integral homology of $\mathrm{GL}_2(\mathbb{Z}[i])$?
Jun 6, 2013
question
6
Centralizers of reflections in parabolic subgroups of Coxeter groups
Mar 17, 2015
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8
How to follow a country during the olympics (Google now)
7
What are some recent, interesting, accessible pieces of mathematics
6
Centralizers of reflections in special subgroups of Coxeter groups

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