User leo - Mathematics Stack Exchange

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	2,695 reputation	bio	website		visits	member for	2 years, 2 months
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137

273

votes

6

answers

60

kviews

Why can you turn clothing right-side-out?

general-topology algebraic-topology

may 20 at 2:36 Double AA 169

165

266

votes

115

answers

13

kviews

What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)

may 6 at 4:59 Jori Mäntysalo 31

49

138

votes

14

answers

17

kviews

Given an infinite number of monkeys and an infinite amount of time, would one of them write Hamlet?

probability infinity

dec 2 '11 at 17:50 comonad 179

91

131

votes

17

answers

8

kviews

Different methods to compute $\sum\limits_{n=1}^\infty \frac{1}{n^2}$

sequences-and-series complex-analysis fourier-analysis big-list faq

mar 8 at 13:57 xpaul 1

27

121

votes

2

answers

12

kviews

Proving you can't make $2011$ out of $1,2,3,4$: nice twist on the usual

number-theory elementary-number-theory recreational-mathematics

jan 3 '12 at 16:17 David Bevan 2,815

54

117

votes

27

answers

7

kviews

Too old to start math

soft-question intuition self-learning learning advice

mar 12 at 19:05 Harry Weston 211

51

106

votes

20

answers

7

kviews

Is mathematics one big tautology?

soft-question philosophy

2d ago ThisIsNotAnId 474

110

106

votes

35

answers

7

kviews

Fun but serious mathematics books to gift advanced undergraduates.

reference-request soft-question big-list

feb 25 at 22:57 arielf 101

51

103

votes

18

answers

8

kviews

Nice examples of groups which are not obviously groups

abstract-algebra group-theory examples-counterexamples big-list

may 3 at 8:54 Dominic Michaelis 11.9k

28

91

votes

6

answers

17

kviews

Deleting any digit yields a prime… is there a name for this?

elementary-number-theory prime-numbers recreational-mathematics

oct 8 '11 at 7:00 jorox 54

46

86

votes

28

answers

10

kviews

Best Fake Proofs? (A M.SE April Fools Day collection)

soft-question big-list fake-proofs

apr 15 at 8:44 P.. 8,915

26

84

votes

1

answer

2

kviews

Does the open mapping theorem imply the Baire category theorem?

functional-analysis set-theory banach-spaces axiom-of-choice baire-category

dec 10 at 23:50 Pedro Lauridsen Ribeiro 37

86

82

votes

22

answers

5

kviews

List of Interesting Math Videos/ Documentaries

soft-question big-list

may 10 at 4:14 cyclochaotic 406

22

82

votes

4

answers

2

kviews

What do modern-day analysts actually do?

analysis complex-analysis soft-question pde harmonic-analysis

jun 7 '12 at 5:05 Paul Siegel 2,170

40

65

votes

6

answers

4

kviews

How can you prove that a function has no closed form integral?

calculus real-analysis integration differential-algebra

sep 19 at 17:52 Nils Matthes 1,083

36

64

votes

2

answers

6

kviews

Topology: The Board Game

general-topology algebraic-topology soft-question education

apr 28 at 5:06 George 51

26

62

votes

7

answers

5

kviews

Tablet for reading textbooks and writing math by hand?

soft-question math-software learning hardware

mar 28 at 16:04 hhh 1,500

20

58

votes

5

answers

2

kviews

Root Calculation by Hand

arithmetic exponentiation

may 3 '12 at 10:06 Antonio Vargas 6,708

51

55

votes

25

answers

5

kviews

What is the single most influential book every mathematician should read?

soft-question big-list reference-request

aug 5 at 21:53 sam boosalis 1

45

52

votes

21

answers

3

kviews

List of Interesting Math Blogs

soft-question big-list online-resources

apr 25 at 3:25 Bean 849

32

49

votes

16

answers

8

kviews

If $AB = I$ then $BA = I$

linear-algebra matrices

may 1 at 22:19 mezhang 1,423

16

45

votes

6

answers

1

kviews

How far can one get in analysis without leaving $\mathbb{Q}$?

analysis number-theory logic philosophy constructive-mathematics

may 10 at 16:03 Alexander Gruber♦ 15.2k

12

44

votes

3

answers

2

kviews

Cute Determinant Question

linear-algebra determinant

jul 30 at 9:55 J. M. 38.9k

21

43

votes

7

answers

2

kviews

Math and mental fatigue

soft-question

mar 31 at 15:20 Joachim 1,191

14

41

votes

3

answers

1

kviews

Is it possible for a function to be in $L^p$ for only one $p$?

real-analysis measure-theory functional-analysis banach-spaces examples-counterexamples

dec 9 '11 at 13:48 t.b. 43.2k

6

40

votes

6

answers

2

kviews

Why is $\omega$ the smallest $\infty$?

logic set-theory cardinals infinity

dec 5 at 11:21 Mark 304

17

40

votes

3

answers

896

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Paul Erdos's Two-Line Functional Analysis Proof

functional-analysis reference-request math-history

feb 15 at 4:12 zyx 11.1k

21

39

votes

4

answers

1

kviews

$\pi$ in arbitrary metric spaces

metric-spaces pi

dec 25 at 17:07 CBenni 1,020

16

39

votes

8

answers

734

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Are there real world applications of finite group theory?

abstract-algebra group-theory finite-groups big-list applications

mar 16 at 18:38 Alexander Gruber♦ 15.2k

16

39

votes

1

answer

652

views

Fractal behavior along the boundary of convergence?

complex-analysis power-series plane-curves fractals

dec 22 '11 at 7:28 Robert Israel 86.4k

leo

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