Mathematics
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kpax
  • Member for 10 years, 2 months
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All Questions Answers
Score Newest
question
22
A problem about an $R$-module that is both injective and projective.
Nov 29, 2013
question
9
A finite unital and commutative ring with exactly one maximal ideal has $p^{n}$ elements.
Dec 25, 2013
question
9
If $G$ is an infinite group, then the group ring $R(G)$ is not semisimple.
Dec 25, 2013
question
8
suppose $n$ people are in a party and every two of them have exactly one common friends,prove that there is one who is friend to all.
Dec 23, 2014
question
8
suppose that $n$ is natural number and even, show that $n \nmid 1^n +2^n+3^n + \ldots (n-1)^n$.
Jan 11, 2015
question
7
examples of additive categories which have morphism that has no kernel and morphism has no cokernels.
Sep 28, 2014
question
7
what is the homology groups some quotient space of torus
May 27, 2014
question
6
Let $f$ be a morphism of chain complexes. Show that if $ker(f)$ and $coker(f)$ are acyclic, then $f$ is a quasi-isomorphism.
Oct 10, 2014
question
5
Can we make the real numbers a $\mathbb{C}$-vector space?
Sep 27, 2013
question
5
prove or supply counter example about graph
May 10, 2014

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