User scsnm - Mathematics Stack Exchange

10 votes

1 answer

329 views

How many groups of order at most $25$ are "pleasant" (abelian, with every non-identity element having prime order)?

asked Aug 22, 2019 at 20:39

6 votes

4 answers

185 views

A binary operation on $G$ satisfies $a\cdot(b\cdot c)=(a\cdot b)\cdot (a\cdot c)$ and has an identity, is it a group?

asked Aug 22, 2019 at 19:16

4 votes

1 answer

96 views

Right exactness of quotienting out the maximal divisible subgroup

asked Jul 30, 2020 at 4:11

4 votes

2 answers

388 views

arrow category and functor category

asked Jul 24, 2020 at 14:00

4 votes

1 answer

96 views

elementary abelian 2-groups extension

asked Feb 15, 2022 at 10:24

4 votes

1 answer

77 views

construct the normaliser of a subgroup and then construct the subgroup

asked Aug 21, 2022 at 7:01

3 votes

1 answer

133 views

Abelian group and faithful representation

asked Nov 25, 2022 at 9:05

3 votes

1 answer

62 views

$GL_2(K)$ and $SL_2(K)\circ_2 T_1$

asked Feb 22, 2022 at 7:17

3 votes

1 answer

106 views

dimension of centraliser

asked May 31, 2022 at 10:50

3 votes

1 answer

55 views

inclusion among finite symplectic groups

asked Aug 9, 2022 at 0:42

3 votes

0 answers

85 views

For $P$ the set of all primes, ${\rm Hom}(\Bbb Z,\sum_{p\in P}\Bbb Z_p)\not\cong\prod_{p\in P}{\rm Hom}(\Bbb Z,\Bbb Z_p)$

asked Jan 6, 2022 at 12:33

3 votes

1 answer

59 views

Projective and injective modules are compatible with block decompositions of algebras in an obvious way.

asked Aug 27, 2020 at 9:29

3 votes

2 answers

366 views

What is the center of $End_A(S)$?

asked Aug 29, 2020 at 16:32

3 votes

1 answer

100 views

Indecomposable or not?

asked May 21, 2020 at 9:29

3 votes

3 answers

1k views

analytic function that maps the entire complex plane into the real axis

asked Aug 24, 2019 at 15:27

3 votes

2 answers

64 views

are the two definite integrals necessarily different?

asked Oct 11, 2019 at 12:21

3 votes

2 answers

1k views

set of all uncountable subsets of R

asked Oct 23, 2019 at 12:11

2 votes

1 answer

101 views

a counter example for 2nd derivative

asked Oct 24, 2019 at 7:25

2 votes

2 answers

55 views

quick way to count

asked Oct 20, 2019 at 4:51

2 votes

2 answers

97 views

does this operation hold?

asked Oct 12, 2019 at 9:26

2 votes

1 answer

184 views

Indecomposable quotient

asked May 25, 2020 at 1:26

2 votes

1 answer

352 views

Homomorphic image of a projective module

asked May 17, 2020 at 2:32

2 votes

1 answer

267 views

Is $B$ a finitely generated $R$-module?

asked Jul 2, 2020 at 2:19

2 votes

1 answer

74 views

Ext of the rationals Q is a vector space over the rationals

asked Jul 30, 2020 at 8:17

2 votes

0 answers

207 views

Normalizer of Levi subgroup

asked Feb 3, 2022 at 10:54

2 votes

0 answers

47 views

quotient of a centralizer

asked Feb 11, 2022 at 9:21

2 votes

0 answers

77 views

centralizer in Magma

asked May 8, 2021 at 6:21

2 votes

1 answer

81 views

$X⊗_A$ − sends finite dimensional module to a projective module

asked Oct 2, 2020 at 12:41

2 votes

1 answer

697 views

maximal torus and semisimple elements

asked Dec 17, 2020 at 16:18

2 votes

0 answers

121 views

component B in the commuting algebra

asked Apr 26, 2022 at 5:15

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169 Questions

How many groups of order at most $25$ are "pleasant" (abelian, with every non-identity element having prime order)?

A binary operation on $G$ satisfies $a\cdot(b\cdot c)=(a\cdot b)\cdot (a\cdot c)$ and has an identity, is it a group?

Right exactness of quotienting out the maximal divisible subgroup

arrow category and functor category

elementary abelian 2-groups extension

construct the normaliser of a subgroup and then construct the subgroup

Abelian group and faithful representation

$GL_2(K)$ and $SL_2(K)\circ_2 T_1$

dimension of centraliser

inclusion among finite symplectic groups

For $P$ the set of all primes, ${\rm Hom}(\Bbb Z,\sum_{p\in P}\Bbb Z_p)\not\cong\prod_{p\in P}{\rm Hom}(\Bbb Z,\Bbb Z_p)$

Projective and injective modules are compatible with block decompositions of algebras in an obvious way.

What is the center of $End_A(S)$?

Indecomposable or not?

analytic function that maps the entire complex plane into the real axis

are the two definite integrals necessarily different?

set of all uncountable subsets of R

a counter example for 2nd derivative

quick way to count

does this operation hold?

Indecomposable quotient

Homomorphic image of a projective module

Is $B$ a finitely generated $R$-module?

Ext of the rationals Q is a vector space over the rationals

Normalizer of Levi subgroup

quotient of a centralizer

centralizer in Magma

$X⊗_A$ − sends finite dimensional module to a projective module

maximal torus and semisimple elements

component B in the commuting algebra