solovei

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160

126

votes

59

answers

64k

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Proofs without words [closed]

examples big-list intuition

dec 2 at 7:18 Alon Amit 4,025●14●38

6

25

votes

3

answers

2k

views

Feit-Thompson Theorem: The Odd Order Paper

finite-groups gr.group-theory proof-theory abstract-algebra

may 3 11 at 4:05 Geoff Robinson 9,856●1●21●27

5

19

votes

4

answers

722

views

What relationship, if any, is there between the diameter of the Cayley graph and the average distance between group elements?

graph-theory gr.group-theory

apr 13 11 at 5:37 Denis Chaperon de Lauzières 2,194●2●8

3

11

votes

5

answers

1k

views

Proofs of Jacobi’s four-square theorem

nt.number-theory modular-forms elliptic-functions

feb 1 12 at 21:51 Kevin O'Bryant 6,442●1●27●54

4

7

votes

1

answer

563

views

Orthogonal group of quadratic form

nt.number-theory quadratic-forms

sep 26 11 at 5:08 M.B 1,130●1●3●10

6

7

votes

4

answers

2k

views

Is there a simple way to compute the number of ways to write a positive integer as the sum of three squares?

pr.probability nt.number-theory

apr 26 10 at 22:36 Will Jagy 12.5k●1●26●45

4

3

votes

3

answers

6k

views

Enumerating ways to decompose an integer into the sum of two squares

nt.number-theory sums-of-squares

jul 20 at 21:37 unknown (yahoo) 11●1

5

3

votes

4

answers

745

views

Commuting matrices in GL(n,Z)

gr.group-theory matrices reference-request

feb 16 11 at 17:37 David Speyer 54.9k●3●102●236

1

3

votes

1

answer

200

views

Fundamental domain for group generated by reflections in -2 curves

ag.algebraic-geometry quadratic-forms

aug 9 11 at 16:55 Agol 23.9k●1●33●84