User Ehud Meir

14 votes

Accepted

The term $H^1(N,A)^{G/N}$ in the inflation-restriction exact sequence

answered Jul 30, 2015 at 12:22

12 votes

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Which finite groups have no irreducible representations other than characters?

answered Aug 4, 2015 at 13:16

11 votes

Accepted

The conjugacy classes of diagonalizable $2 \times 2$ matrices can be identified with their eigenvalues, what about pairs?

answered Aug 3, 2015 at 16:44

10 votes

Accepted

Infinite groups of finite exponent inside of SL(2,C)

answered Aug 16, 2015 at 19:34

10 votes

Accepted

minimum-maximum entries matrix

answered Jan 4, 2017 at 16:01

8 votes

Accepted

If $\mathcal{A} \equiv \mathcal{B}$ and $\mathcal{A} \not \cong \mathcal{B}$, is it possible that $\mathcal{A}$ and $\mathcal{B}$ are bi-embeddable?

answered Aug 25, 2016 at 15:52

6 votes

$G$ cocycle split and trivialized to a coboundary in $J$, given a group homomorphism $J \overset{r}{\rightarrow} G$

answered Sep 12, 2016 at 11:38

6 votes

Primitive elements in group hopf algebras over fields of non-zero characteristic

answered Sep 15, 2016 at 10:14

6 votes

Accepted

$G$ cocycle split to a coboundary in $J$, via a group extension

answered Sep 21, 2016 at 11:15

6 votes

Intuition behind basic facts about homogeneous ideals?

answered Aug 4, 2015 at 2:29

5 votes

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Is an associative division algebra required for this phenomenon?

answered Aug 19, 2015 at 11:05

5 votes

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Field of definition of an algebraic set

answered May 5, 2016 at 14:09

5 votes

Accepted

Computation of group homology $H_2 ((\mathbb{Z}/3\mathbb{Z}) \rtimes (\mathbb{Z}/4\mathbb{Z}),\mathbb{Z})$

answered Aug 14, 2018 at 14:54

4 votes

Accepted

Is Sweedler's Hopf algebra factorizable?

answered Jul 28, 2017 at 13:43

4 votes

Accepted

Identifying projective representations using "gauge-invariant" traces tr[V_g V_h V_k ... ]

answered Feb 1, 2017 at 22:25

4 votes

Accepted

Irreducible representations of the reductive quotient

answered Dec 2, 2016 at 11:08

4 votes

Accepted

Shapiro's lemma in the language of group extensions

answered Dec 2, 2016 at 12:15

4 votes

Accepted

Is there a finite test for isomorphisms of rigid monoidal abelian categories?

answered Feb 5, 2016 at 16:27

3 votes

Faithful exact functors to tensor categories

answered Dec 1, 2015 at 17:38

3 votes

Accepted

Semisimple monoidal category with duals

answered Aug 4, 2015 at 17:47

3 votes

Approximation of Group Schemes over valuation rings

answered Aug 4, 2015 at 7:59

3 votes

Accepted

Involutive automorphisms of a finite abelian p-group

answered Aug 3, 2015 at 12:11

3 votes

Jacobson radical of group algebra

answered Nov 11, 2016 at 14:12

3 votes

Accepted

Trivialize a cup-product 3-cocycle of $G$ in a larger group $J$

answered Nov 11, 2016 at 14:40

3 votes

Accepted

Classification of finite-dimensional continuous irreps of affine group up to isomophism?

answered Nov 11, 2016 at 15:49

3 votes

Accepted

$SO(3)$ 2-cocycle trivialized to a 2-coboundary in $SU(2)$?

answered Nov 13, 2016 at 23:37

3 votes

How many multiplications are needed to generate a matrix algebra?

answered Feb 3, 2017 at 15:21

3 votes

Accepted

Isomorphism concerning $Soc(M_n(R))$

answered Jan 21, 2017 at 19:38

3 votes

Accepted

Does convergence in orbit imply convergence in group for finite stabilizer?

answered Jan 22, 2017 at 14:32

3 votes

Continuous linear combination of continuously varying vectors?

answered Feb 28, 2017 at 23:11

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59 Answers

The term $H^1(N,A)^{G/N}$ in the inflation-restriction exact sequence

Which finite groups have no irreducible representations other than characters?

The conjugacy classes of diagonalizable $2 \times 2$ matrices can be identified with their eigenvalues, what about pairs?

Infinite groups of finite exponent inside of SL(2,C)

minimum-maximum entries matrix

If $\mathcal{A} \equiv \mathcal{B}$ and $\mathcal{A} \not \cong \mathcal{B}$, is it possible that $\mathcal{A}$ and $\mathcal{B}$ are bi-embeddable?

$G$ cocycle split and trivialized to a coboundary in $J$, given a group homomorphism $J \overset{r}{\rightarrow} G$

Primitive elements in group hopf algebras over fields of non-zero characteristic

$G$ cocycle split to a coboundary in $J$, via a group extension

Intuition behind basic facts about homogeneous ideals?

Is an associative division algebra required for this phenomenon?

Field of definition of an algebraic set

Computation of group homology $H_2 ((\mathbb{Z}/3\mathbb{Z}) \rtimes (\mathbb{Z}/4\mathbb{Z}),\mathbb{Z})$

Is Sweedler's Hopf algebra factorizable?

Identifying projective representations using "gauge-invariant" traces tr[V_g V_h V_k ... ]

Irreducible representations of the reductive quotient

Shapiro's lemma in the language of group extensions

Is there a finite test for isomorphisms of rigid monoidal abelian categories?

Faithful exact functors to tensor categories

Semisimple monoidal category with duals

Approximation of Group Schemes over valuation rings

Involutive automorphisms of a finite abelian p-group

Jacobson radical of group algebra

Trivialize a cup-product 3-cocycle of $G$ in a larger group $J$

Classification of finite-dimensional continuous irreps of affine group up to isomophism?

$SO(3)$ 2-cocycle trivialized to a 2-coboundary in $SU(2)$?

How many multiplications are needed to generate a matrix algebra?

Isomorphism concerning $Soc(M_n(R))$

Does convergence in orbit imply convergence in group for finite stabilizer?

Continuous linear combination of continuously varying vectors?