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qwerty1793

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213

116

votes

65

answers

45k

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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 1,368●4●17

36

89

votes

15

answers

7k

views

When and how is it appropriate for an undergraduate to email a professor out of the blue?

advice soft-question

aug 31 11 at 17:19 Gil Kalai 11.1k●6●81●146

106

86

votes

43

answers

36k

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Magic trick based on deep mathematics

popularization soft-question

jun 10 at 22:54 Magic Maniac 1●1

21

64

votes

4

answers

2k

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Light rays bouncing in twisted tubes

mg.metric-geometry geometry ds.dynamical-systems billiards

dec 10 11 at 1:51 Joseph O'Rourke 44.1k●1●50●216

9

44

votes

4

answers

3k

views

Tying knots with reflecting lightrays

geometry knot-theory

nov 14 at 1:37 Joseph O'Rourke 44.1k●1●50●216

20

42

votes

8

answers

5k

views

The “sensitivity” of 2-colorings of the d-dimensional integer lattice

co.combinatorics computational-complexity graph-colorings open-problem

aug 25 11 at 16:57 Meena Boppana 71●1●3

32

36

votes

13

answers

4k

views

What are some of the big open problems in 3-manifold theory?

3-manifolds open-problem big-list open-problems-list gt.geometric-topology

may 30 at 15:46 Ryan Budney 21.8k●1●41●102

10

34

votes

2

answers

1k

views

Knot security (When to trust your life with a knot)

knot-theory gt.geometric-topology

sep 19 at 8:04 Arnab 203●1●7

5

26

votes

3

answers

2k

views

Is there a reset sequence?

gr.group-theory co.combinatorics gt.geometric-topology ds.dynamical-systems

nov 11 10 at 17:45 Mark Sapir 27.9k●2●57●120

14

26

votes

1

answer

1k

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Does this knot invariant distinguish trefoil chiralities?

knot-theory stick-knots gn.general-topology graph-theory

may 4 12 at 10:47 ARupinski 3,428●7●26

7

25

votes

3

answers

869

views

Random knot on six vertices

knot-theory pr.probability

feb 10 11 at 11:12 aorq 2,470●17●36

12

23

votes

2

answers

810

views

A Pachner complex for triangulated manifolds

gt.geometric-topology at.algebraic-topology manifolds

aug 10 10 at 16:17 Kevin Walker 6,187●1●11●32

9

23

votes

8

answers

1k

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In knot theory: Benefits of working in $S^3$ instead of $\mathbb{R}^3$?

gt.geometric-topology knot-theory

may 20 11 at 16:45 Kevin Walker 6,187●1●11●32

8

23

votes

19

answers

2k

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What is the easiest randomized algorithm to motivate to the layperson?

computational-complexity algorithms

jan 7 12 at 14:57 maldini.ua 53●4

4

20

votes

3

answers

793

views

Forbidden mirror sequences

geometry discrete-geometry reference-request

jan 8 12 at 3:12 Joseph O'Rourke 44.1k●1●50●216