User JJR - Mathematics Stack Exchange

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	1,075 reputation	bio	website		visits	member for	10 months
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1

vote

1

answer

37

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How to find instances when $d(a,b) = p^2$ for $p$ a prime.

combinatorics reference-request

1h ago A Walker 2,476

0

votes

0

answers

21

views

Representation of even/odd type

terminology representation-theory

2d ago JJR 1,075

1

vote

0

answers

20

views

How to write down the maximal subgroups of $GL(9, \mathbb{C})$

reference-request representation-theory lie-groups

may 14 at 15:30 JJR 1,075

0

votes

0

answers

19

views

Computing a restriction of a representation

combinatorics representation-theory

apr 29 at 2:27 JJR 1,075

3

votes

1

answer

33

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How to compute the weights of $\Gamma_{3,1}$ the irrep of $\mathfrak{sl}_3\Bbb C$

combinatorics representation-theory symmetric-polynomials

apr 28 at 14:08 Alistair Savage 1,509

1

vote

1

answer

46

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Weights versus roots

representation-theory

apr 28 at 20:41 Alistair Savage 1,509

1

vote

2

answers

27

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Computing eigenvalues for $\mathrm{Sym}^2(\mathrm{Sym}^3 V))$ for $V = \Bbb C^2$

representation-theory eigenvalues tensor-products symmetric-polynomials

apr 27 at 19:51 Marc van Leeuwen 23.9k

1

vote

0

answers

23

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Branching rule restriction to $\mathrm{O}_9 \Bbb C$ from $\mathrm{GL}_9 \Bbb C$

representation-theory tensor-products symmetric-functions

apr 27 at 3:15 JJR 1,075

2

votes

0

answers

45

views

Subspaces stabilized by representations of $\mathrm O(9)$

reference-request representation-theory

apr 21 at 21:30 JJR 1,075

0

votes

1

answer

26

views

Standard representation of $\frak S_4$

representation-theory

apr 10 at 18:28 joriki 92.7k

6

votes

2

answers

73

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Factoring $x^{255} -1 $ over $\Bbb F_2$

galois-theory

apr 8 at 20:17 JJR 1,075

1

3

votes

2

answers

44

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Galois relations between subfields

galois-theory extension-field

mar 7 at 2:58 JSchlather 9,735

3

votes

1

answer

56

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Connection between Galois trace and matrix trace

galois-theory

feb 28 at 1:21 Dimitri 446

1

vote

0

answers

65

views

American undergraduate applying overseas

soft-question

feb 21 at 20:49 JJR 1,075

3

votes

1

answer

46

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Character of a permutation representation

representation-theory characters

feb 21 at 11:29 Martin Sleziak 20.3k

4

votes

1

answer

50

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Basic identity of characters

representation-theory

feb 20 at 3:49 BenjaLim 16.8k

1

3

votes

2

answers

100

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Subgroups of order $p$ and $p^{n-1}$ in a group of order $p^n$.

abstract-algebra group-theory finite-groups p-groups

apr 26 at 1:18 Alexander Gruber♦ 15.2k

1

vote

1

answer

52

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Cardano's Formulas help

galois-theory

jan 14 at 20:01 André Nicolas 161k

0

votes

1

answer

19

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Bijection between permissible cycle types and conjugacy classes

abstract-algebra

jan 9 at 19:11 Tobias Kildetoft 4,746

1

vote

1

answer

78

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For $G$ a group, if $|G| = n$, $n$ composite, will $G$ have a proper subgroup?

abstract-algebra

dec 4 at 0:45 user44441 161

1

vote

2

answers

133

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Is the conjugation map always an isomorphism?

abstract-algebra

dec 4 at 15:33 amWhy 54.8k

1

vote

1

answer

49

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How to prove that $\mathrm{GL}_2(\Bbb Z_2)$ has only six subgroups

abstract-algebra

nov 28 at 21:04 joriki 92.7k

1

8

votes

3

answers

114

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Cardinality of the Union is less than the cardinality of the Cartesian product

set-theory cardinals

nov 26 at 20:40 Michael Greinecker♦ 12.5k

1

vote

2

answers

78

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Trouble with this multiplication table

homework abstract-algebra

nov 25 at 23:43 Lubin 5,946

2

votes

3

answers

79

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$S_n$ acting transitively on $\{1, 2, \dots, n\}$

abstract-algebra group-theory finite-groups permutations

nov 23 at 5:33 Alexander Gruber♦ 15.2k

2

1

vote

3

answers

166

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Problems like the handshake problem

reference-request recreational-mathematics problem-solving

nov 23 at 15:02 amWhy 54.8k

2

votes

3

answers

158

views

How fill in this multiplication table?

abstract-algebra

nov 26 at 3:13 Michael Hardy 48.2k

5

votes

1

answer

428

views

Convergence in probability, not almost surely

real-analysis probability-theory

nov 10 at 1:42 Henry 32.1k

0

votes

4

answers

103

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Is $\Bbb Z_3 [x] / \langle x^2 - 1 \rangle \cong \Bbb Z_3 \times \Bbb Z_3$?

abstract-algebra

nov 9 at 2:04 Berci 20.7k

1

2

votes

1

answer

96

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Counterexamples to the following logical statements about sets

elementary-set-theory

nov 4 at 21:48 Brian M. Scott 155k

JJR

71 Questions