BS

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210

115

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Video lectures of mathematics courses available online for free

ho.history-overview mathematics-education soft-question big-list

mar 8 at 12:25 Nikita Kalinin 1,398●4●17

121

81

votes

30

answers

23k

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Real-world applications of mathematics, by arxiv subject area?

applications mathematics-education popularization big-list

jun 29 at 18:37 Terry Tao 28k●4●108●183

32

69

votes

3

answers

3k

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Is R^3 the square of some topological space?

topology

jan 19 at 0:12 Adam Epstein 946●2●12

57

66

votes

107

answers

22k

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Most memorable titles [closed]

writing big-list advice soft-question

mar 1 at 8:26 Gil Kalai 10.7k●6●80●144

34

63

votes

3

answers

2k

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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●56

40

56

votes

6

answers

3k

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Counterexamples in algebraic topology?

at.algebraic-topology examples

mar 29 at 2:19 Ricardo Andrade 2,402●1●9●18

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54

votes

1

answer

3k

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Nontrivial finite group with trivial group homologies?

gr.group-theory group-cohomology open-problem

feb 10 at 22:44 Dennis Sullivan 121●1●2

24

54

votes

5

answers

2k

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Gaussian prime spirals

complex-geometry discrete-geometry prime-numbers

feb 17 at 1:03 Joseph O'Rourke 43.4k●1●50●214

30

52

votes

2

answers

3k

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Riemann hypothesis via absolute geometry

ag.algebraic-geometry nt.number-theory f-1

jul 5 11 at 16:26 gowers 17.8k●9●77●131

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votes

2

answers

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How many relations of length $n$ can exists in a group without enforcing shorter relations?

gr.group-theory

oct 28 11 at 19:22 MathOverflow♦ 1●2●3

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43

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3

answers

4k

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Intuitive explanation for the Atiyah-Singer index theorem

kt.k-theory-homology vector-bundles characteristic-classes

may 13 10 at 5:46 Dev Sinha 2,470●10●20

38

43

votes

7

answers

4k

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Homotopy groups of Lie groups

at.algebraic-topology lie-groups

apr 12 11 at 20:03 Enrique Macias 81●2

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42

votes

1

answer

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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

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1

answer

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Which small finite simple groups are not yet known to be Galois groups over Q?

nt.number-theory finite-groups galois-theory reference-request

nov 9 11 at 5:53 Greg Kuperberg 36.3k●2●116●179

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6

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Which of Quillen’s Papers Should I read?

at.algebraic-topology algebraic-k-theory

may 6 11 at 12:54 Steven Landsburg 8,642●1●28●47