User Babgen - Mathematics Stack Exchange

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	1,145 reputation	bio	website		visits	member for	2 years
313 badges		location	Yerevan, Armenia		seen	47 mins ago

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Example of a Borel set that is neither $F_\sigma$ nor $G_\delta$

nov 11 '11 at 19:54 t.b. 43.1k

1

8

votes

4

answers

227

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Number of solutions of $x^2_1+\dots+x^2_n=0,$ $x_i\in \Bbb{F}_q.$

number-theory finite-fields

aug 16 at 23:58 paul garrett 10.5k

2

7

votes

4

answers

430

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PSL(2,C) and PGL(2,C)

abstract-algebra group-theory

mar 20 '12 at 8:55 late_learner 1,555

6

votes

1

answer

411

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order of element in symmetric group

group-theory symmetric-groups

jan 25 '12 at 20:32 Jonas Meyer 34.9k

1

5

votes

3

answers

109

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Subgroup with infinite index

abstract-algebra group-theory

feb 10 at 16:55 YACP 8,930

1

5

votes

1

answer

133

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Create Graph In Sage

sage

aug 23 at 13:34 JSchlather 9,705

3

5

votes

2

answers

128

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Torsion subgroup of $SL(n,\mathbb Z)$

linear-algebra group-theory matrices

apr 23 '12 at 13:07 Davide Giraudo 55.8k

1

4

votes

1

answer

110

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Frattini subgroup of $\operatorname{Hol}(\mathbb Q)$

group-theory

feb 17 at 6:55 Babgen 1,145

4

votes

1

answer

87

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If each matrix representing $T$ contains a $0$, then $T$ is a scalar

linear-algebra

jul 3 at 20:08 Robert Israel 85.9k

1

4

votes

1

answer

120

views

Is $K_n\times K_n$ a Cayley graph?

group-theory graph-theory

jan 3 '12 at 0:25 J. M. 38.8k

3

votes

2

answers

123

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Abelian groups whose subgroup lattice is chain

group-theory

sep 27 at 13:50 Marc van Leeuwen 23.5k

3

votes

0

answers

49

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Superfluous subgroups or small subgroup

group-theory

sep 12 at 15:48 Michael Hardy 47.7k

1

3

votes

1

answer

140

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$(\mathbb R^2,+)$ as vector space over $\mathbb R$

linear-algebra vector-spaces

jun 23 at 19:42 Arturo Magidin 158k

2

3

votes

1

answer

106

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Center of SO(V,q)

group-theory finite-groups quadratic-forms

jun 4 '12 at 20:03 Derek Holt 8,253

2

3

votes

1

answer

170

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$PGL(n, F)=PSL(n, F)$

group-theory matrices

mar 20 '12 at 8:56 late_learner 1,555

1

2

votes

1

answer

199

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The number of subspaces of a vector space

linear-algebra combinatorics vector-spaces finite-fields

may 14 at 9:48 azimut 5,386

2

votes

0

answers

35

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Module with finitely many submodules

modules

mar 20 at 19:50 Babgen 1,145

2

votes

0

answers

126

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Nondegenerate symmetric bilinear forms

linear-algebra abstract-algebra bilinear-form

mar 7 at 11:42 azimut 5,386

2

votes

0

answers

78

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Maximal ideal of ring of matrices

linear-algebra ring-theory

jan 12 at 18:47 Babgen 1,145

2

votes

1

answer

50

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$A\times B\cong M$

modules

oct 5 at 8:05 Chris Eagle 20.6k

2

votes

1

answer

85

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Simultaneous Orthogonalization

abstract-algebra quadratic-forms

jul 5 at 17:40 Community♦ 1

2

votes

1

answer

81

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The level of a $p$-adic number field

number-theory field-theory algebraic-number-theory

may 25 '12 at 6:27 Ted 7,509

2

votes

1

answer

101

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centralizer of transvection

abstract-algebra group-theory

mar 27 '12 at 8:46 Derek Holt 8,253

2

votes

0

answers

127

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General Linear Group

group-theory reference-request

feb 12 '12 at 20:58 Babgen 1,145

2

votes

1

answer

153

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Automorphism of graph

group-theory graph-theory

jan 2 '12 at 15:06 Babgen 1,145

2

votes

1

answer

328

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Graph isomorphic

graph-theory

dec 22 '11 at 21:55 Babgen 1,145

2

votes

1

answer

346

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Nowhere dense set with positive Lebesgue measure

real-analysis measure-theory

oct 17 '11 at 12:46 t.b. 43.1k

2

votes

5

answers

161

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vertical asymptote of derivatives function

real-analysis analysis

jul 20 '11 at 20:43 Patrick Da Silva 13.3k

2

votes

0

answers

125

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The vertical asymptote of derivatives function

calculus

jul 20 '11 at 16:34 Shai Covo 16.9k

1

vote

1

answer

73

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Maximal Normal Subgroup of Supersolvable Group

abstract-algebra group-theory

jan 25 at 21:34 Babgen 1,145

Babgen

52 Questions