Mathematics
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ShinyaSakai
  • Member for 12 years, 9 months
  • Last seen more than 10 years ago
  • CHINA(中国)
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Top posts
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All Questions Answers
Score Newest
question
49
$A_n$ is the only subgroup of $S_n$ of index $2$.
Mar 14, 2011
question
46
Example of modules that are projective but not free; torsion-free but not free
Mar 15, 2011
question
42
What is the difference between "family" and "set"?
Apr 27, 2011
question
38
$[(x-a_1)(x-a_2) \cdots (x-a_n)]^2 +1$ is irreducible over $\mathbb Q$
Mar 1, 2013
question
28
Why isn't $\mathbb{C}[x,y,z]/(xz-y)$ a flat $\mathbb{C}[x,y]$-module
Feb 18, 2012
question
26
How to get a group from a semigroup
Oct 30, 2011
question
22
The automorphism group of a direct product of abelian groups is isomorphic to a matrix group
Aug 3, 2011
question
19
Are associates unit multiples in a commutative ring with $1$?
Dec 14, 2010
question
19
Why are parabolic subgroups called "parabolic" subgroups?
Dec 23, 2011
question
19
What is a $p$-adic group
Sep 21, 2012
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What does 「父なる砂漠」mean?

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