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user16924
  • Member for 9 years, 8 months
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10 votes
2 answers
3k views

Commutative ring is semisimple iff it's isomorphic to a finite direct product of fields.

8 votes
3 answers
19k views

Number of ways of distributing balls into boxes

8 votes
2 answers
1k views

Lebesgue integral, differentiation under the integral sign

7 votes
1 answer
2k views

Geometric distribution obtained from exponential distribution

7 votes
1 answer
2k views

Left ideals of $M_n(K)$ [duplicate]

6 votes
2 answers
1k views

PID and finitely generated module

6 votes
2 answers
801 views

Egorov's theorem application

5 votes
1 answer
1k views

Version of Lusin's theorem on real line

5 votes
2 answers
2k views

Problem related to the ring $\mathbb Z[\sqrt{d}]$

5 votes
3 answers
1k views

In a Noetherian integral domain, a principal prime ideal can't have proper non-zero prime ideals

5 votes
1 answer
957 views

There are no simple groups of order $27p$

5 votes
2 answers
2k views

Group of order $1575$ problem

5 votes
3 answers
2k views

$\mathbb S_n$ as semidirect product

4 votes
1 answer
155 views

Area and volume relation (multivariable calculus problem)

4 votes
1 answer
447 views

Reducible in $R[X]$ implies reducibility in $(R/I)[X]$

4 votes
2 answers
5k views

Group of order $|G|=pqr$, $p,q,r$ primes has a normal subgroup of order

4 votes
5 answers
222 views

Determine if $\mathbb R[X,Y]/I$ is a field

4 votes
1 answer
240 views

Lebesgue integrable function $g$ equals characteristic function

3 votes
2 answers
174 views

Sequence of Lebesgue integrals

3 votes
3 answers
2k views

Group of $2n$ elements, $n$ odd, is not simple

3 votes
0 answers
1k views

Linear map is diagonalizable iff its adjoint is diagonalizable

3 votes
0 answers
1k views

Probability problem of fishes in a lake

3 votes
1 answer
147 views

Representatives of simple modules

3 votes
2 answers
572 views

Irreducible polynomials in two and four variables

3 votes
3 answers
2k views

Special linear group $SL(2,\mathbb Z_3)$ doesn't have subgroups of order $12$

3 votes
1 answer
2k views

Commutator of $D_{2n}$

3 votes
1 answer
2k views

Convergence in measure of product of convergent sequences [duplicate]

3 votes
2 answers
769 views

Zero divisors of $C[0,1]$ [duplicate]

3 votes
0 answers
826 views

Abelian group action exercise

3 votes
1 answer
610 views

Accumulation point in topological space problem

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