Richard Eager

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Name	Richard Eager
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36

44

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4

answers

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Etale cohomology — Why study it?

etale-cohomology nt.number-theory ag.algebraic-geometry at.algebraic-topology

mar 7 at 22:24 Daniel Miller 2,311●8●23

18

42

votes

1

answer

2k

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A = B (but not quite); 3-d arrays with multiple recurrences

combinatorial-identities co.combinatorics

nov 15 11 at 22:12 Brendan McKay 9,120●1●13●33

21

42

votes

1

answer

1k

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Did Grothendieck have a plan for proving Riemann Existence algebraically?

ag.algebraic-geometry

nov 13 11 at 17:35 Joël 9,499●19●52

43

37

votes

30

answers

9k

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Quick proofs of hard theorems

big-list soft-question

jan 25 11 at 0:05 robot 1,647●3●12

19

34

votes

2

answers

2k

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What is the insight of Quillen’s proof that all projective modules over a polynomial ring are free?

ac.commutative-algebra ag.algebraic-geometry projective-module

nov 20 at 23:12 unknown (google) 5,540●6●29

15

31

votes

6

answers

2k

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Non-enumerative proof that there are many derangements?

co.combinatorics permutations enumeration

oct 12 at 19:18 Austin Mohr 207●4●14

16

29

votes

11

answers

4k

views

Contest problems with connections to deeper mathematics.

soft-question problem-solving big-list

may 10 at 9:29 Igor Kortchemski 41●1

22

27

votes

4

answers

3k

views

Is there a good way to think of vanishing cycles and nearby cycles?

ag.algebraic-geometry sheaf-theory motivation intuition

nov 8 09 at 19:20 S. Carnahan♦ 25.6k●41●90

9

27

votes

6

answers

2k

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Can we color Z^+ with n colors such that a, 2a, …, na all have different colors for all a?

nt.number-theory co.combinatorics open-problem

jan 13 12 at 2:16 Andres Caicedo 14.4k●1●42●79

13

27

votes

8

answers

2k

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What are the external triumphs of matroid theory?

matroid-theory

jul 7 at 0:07 Patricia Hersh 2,685●1●9●21

21

26

votes

6

answers

2k

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Why do Littlewood-Richardson coefficients describe the cohomology of the Grassmannian?

ag.algebraic-geometry co.combinatorics intuition

dec 13 at 3:52 Dima Pasechnik 3,080●3●14

24

26

votes

2

answers

2k

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How to unify various reconstruction theorems (Gabriel-Rosenberg, Tannaka,Balmers)

ag.algebraic-geometry noncommutative-geometry big-picture

feb 25 10 at 16:23 Zoran Škoda 3,139●17●27

12

25

votes

9

answers

2k

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What is significant about the half-sum of positive roots?

rt.representation-theory lie-algebras

nov 9 11 at 6:14 S. Carnahan♦ 25.6k●41●90

10

23

votes

1

answer

1k

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A puzzle about finding three points $(x,y)$, $(x,z)$ and $(y,z)$ in a subset of a square.

co.combinatorics pr.probability puzzle

mar 8 11 at 10:41 Pietro Majer 19.7k●1●24●69

13

22

votes

6

answers

2k

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Applications of Grothendieck-Riemann-Roch?

reference-request ag.algebraic-geometry kt.k-theory-homology

apr 29 11 at 17:57 Ariyan Javanpeykar 4,032●5●28