Mathematics
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Censi LI
  • Member for 8 years, 9 months
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  • Paris, France
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A mathematical learner.

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All Questions Answers
Score Newest
answer
18
A finite group which has a unique subgroup of order $d$ for each $d\mid n$.
May 28, 2015
question
18
Does the forgetful functor from $\mathbf{TopGrp}$ to $\mathbf{Top}$ admit a left adjoint?
May 3, 2015
question
16
Can any commutative ring of characteristic $p\in\mathbb P$ be written as the form $R/(p)$ with $R$ being a ring of characteristic $0$?
Jun 5, 2015
answer
11
Example of a ring without unity that has a subring with unity?
Apr 24, 2015
question
11
Does faithful additive functor between abelian categories reflect short exact sequence?
Mar 9, 2017
question
10
Example of a finitely generated faithful torsion module over a commutative ring
Mar 14, 2015
answer
10
Without using Heegner-Stark-Baker, $\mathbb{Q}(\sqrt{-11})$ has class number $1$.
May 18, 2015
question
9
Is composition of regular epimorphisms always regular?
Feb 12, 2016
question
9
What is the class of topological spaces $X$ such that the functors $\times X:\mathbf{Top}\to\mathbf{Top}$ have right adjoints?
May 20, 2015
question
8
Colimit of a direct system of monomorphisms
Nov 11, 2016
Top Meta posts
3
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8
Is that OK to modify a question significantly？
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8
Can every commutative ring of characteristic $p\in\mathbb P$ be written as the form $R/(p)$ with $R$ being a ring of characteristic $0$?
8
Can't make sense of a paragraph from Lovecraft
7
On describing a sort of "well-behaved" subgroups of a free abelian group
5
If $R$ is generated by idempotents, then $\text{Ann}(R)=0$?
5
Problem understanding the word “collect” in this sentence

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