Stephen S

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Name	Stephen S
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71

125

votes

8

answers

5k

views

Two commuting mappings in the disk

gn.general-topology open-problem

may 14 at 11:22 Daniele Zuddas 808●2●9

55

79

votes

38

answers

8k

views

Generalizing a problem to make it easier

big-list

mar 3 12 at 10:17 Uday 1,151●5●14

32

69

votes

3

answers

3k

views

Is R^3 the square of some topological space?

topology

jan 19 at 0:12 Adam Epstein 946●2●12

34

63

votes

3

answers

2k

views

What do the stable homotopy groups of spheres say about the combinatorics of finite sets?

homotopy-theory co.combinatorics stable-homotopy symmetric-group

feb 28 12 at 10:26 Johannes Ebert 11.5k●33●55

24

54

votes

4

answers

4k

views

How can there be topological 4-manifolds with no differentiable structure?

differential-topology four-manifolds

mar 24 11 at 9:00 Benoît Kloeckner 5,489●18●29

32

50

votes

5

answers

2k

views

Is there a sheaf theoretical characterization of a differentiable manifold?

sheaf-theory differential-topology dg.differential-geometry gn.general-topology

feb 16 12 at 13:31 Johannes Ebert 11.5k●33●55

23

46

votes

8

answers

3k

views

Can we unify addition and multiplication into one binary operation? To what extent can we find universal binary operations?

ra.rings-and-algebras lo.logic

dec 3 at 13:00 Mozibur Ullah 806●1●7

10

40

votes

1

answer

4k

views

Order of an automorphism of a finite group

finite-groups gr.group-theory

oct 18 09 at 21:24 Greg Stevenson 5,538●1●16●20

14

39

votes

4

answers

2k

views

Degree of sum of algebraic numbers

nt.number-theory polynomials number-fields galois-theory

jan 30 11 at 15:32 Chandan Singh Dalawat 11.5k●1●39●73

16

38

votes

2

answers

2k

views

Is every sigma-algebra the Borel algebra of a topology?

gn.general-topology set-theory descriptive-set-theory measure-theory

feb 9 12 at 8:38 Jochen Wengenroth 1,534●1●13

26

37

votes

7

answers

3k

views

The main theorems of category theory and their applications

ct.category-theory big-list

jan 1 12 at 5:40 Ed Dean 1,446●1●5●14

16

35

votes

2

answers

1k

views

Is there an odd-order group whose order is the sum of the orders of the proper normal subgroups?

finite-groups gr.group-theory nt.number-theory

feb 21 11 at 9:56 François Brunault 7,419●1●13●35

24

33

votes

6

answers

3k

views

What is the significance of non-commutative geometry in mathematics?

noncommutative-geometry reference-request big-picture

may 26 at 0:44 BY 1,287●1●5●11

14

32

votes

3

answers

2k

views

How do the compact Hausdorff topologies sit in the lattice of all topologies on a set?

gn.general-topology point-set-topology set-theory lattices hausdorff-spaces

1d ago Cameron Buie 41

42

32

votes

10

answers

2k

views

papers archives? (especially not indexed by google)

big-list

feb 7 at 11:24 Thomas Fischer 1