Brian Hopkins

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Name	Brian Hopkins
Member for	2 years
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Website	faculty.spc.edu/pages/154.asp
Location	metro NYC
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14

34

votes

6

answers

2k

views

Which Fibonacci numbers are the sum of two squares?

nt.number-theory

oct 25 at 14:56 joro 4,270●1●10●31

6

24

votes

0

answers

500

views

(Approximately) bijective proof of $\zeta(2)=\pi^2/6$ ?

geometry-of-numbers nt.number-theory co.combinatorics

may 2 12 at 2:14 David Feldman 11.3k●2●25●79

8

22

votes

0

answers

1k

views

Euler and the Four-Squares Theorem

nt.number-theory open-problem sums-of-squares

aug 31 10 at 16:32 Franz Lemmermeyer 17.2k●1●38●101

11

18

votes

3

answers

3k

views

Are nontrivial integer solutions known for $x^3+y^3+z^3=3$?

diophantine-equations nt.number-theory reference-request open-problem

jun 2 11 at 18:48 Noam D. Elkies 18.1k●4●63●91

8

18

votes

0

answers

334

views

Permutations, stopping times, Bessel functions, hook formula and Robinson-Schensted

co.combinatorics pr.probability robinson-schensted

dec 1 11 at 19:04 David Feldman 11.3k●2●25●79

5

17

votes

1

answer

335

views

Salié permutations and fair permutations

co.combinatorics permutations enumerative-combinatorics

nov 28 at 2:37 Richard Stanley 13.3k●2●60●94

11

16

votes

13

answers

2k

views

What are your favorite puzzles/toys for introducing new mathematical concepts to students?

big-list teaching

aug 29 10 at 13:57 sleepless in beantown 2,071●5●13

3

15

votes

0

answers

254

views

Hall’s Marriage Theorem and intervals

co.combinatorics

apr 11 at 11:15 Allen Knutson 12.4k●1●23●64

4

13

votes

0

answers

448

views

A bijection between sets of Young tableaux of two kinds

co.combinatorics

jul 18 11 at 22:41 Igor Pak 8,206●2●17●57

6

13

votes

0

answers

305

views

Monomer-Dimer tatami tilings need better relationships with other math. Summary of results.

tiling generating-functions combinatorial-geometry co.combinatorics graph-theory

jul 31 at 17:07 Alejandro Erickson 311●9

3

13

votes

0

answers

588

views

There are n horses. At a time only k horse can run in the single race. How many minimum races are required to find the top m fastest horses?

co.combinatorics

dec 3 at 17:12 Debanjan Chanda 131●4

7

12

votes

2

answers

916

views

What (if anything) happened to Viennot’s theory of Heaps of pieces?

co.combinatorics statistical-physics reference-request

mar 12 10 at 11:28 Tim Porter 3,735●6●14

3

11

votes

2

answers

654

views

Access to a preprint by D. N. Verma

co.combinatorics combinatorial-geometry ag.algebraic-geometry

mar 1 at 15:14 Gjergji Zaimi 37.5k●2●72●149

3

8

votes

1

answer

1k

views

Looking for a “scientific” application of a recreational puzzle.

partitions recreational reference-request

may 15 12 at 8:52 MathOverflow♦ 1●2●3

3

6

votes

0

answers

229

views

Recovering a group from its number of symmetric embeddings?

gr.group-theory finite-groups

oct 17 at 13:28 F. Ladisch 2,157●3●16