User Gregor Bruns - Mathematics Stack Exchange

bio	website	n/a
	location	Leipzig, Germany
	age	25
visits	member for	11 months
	seen	2 hours ago
stats	profile views	139

	1,097 reputation	bio	website	n/a	visits	member for	11 months
1314 badges		location	Leipzig, Germany		seen	2 hours ago

16

39

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5

answers

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kviews

Why is 987654321/123456789 = 8.0000000729?

arithmetic rational-numbers

6h ago jwg 181

137

272

votes

6

answers

60

kviews

Why can you turn clothing right-side-out?

general-topology algebraic-topology

13h ago Double AA 126

18

21

votes

2

answers

2

kviews

What do eigenvalues have to do with pictures?

linear-algebra eigenvalues eigenvectors image-processing

1d ago J. M. 38.9k

2

20

votes

7

answers

656

views

How are we able to calculate specific numbers in the Fibonacci Sequence?

linear-algebra combinatorics generating-functions fibonacci-numbers

1d ago Martin Sleziak 20.3k

47

50

votes

14

answers

7

kviews

Mathematical equivalent of Feynman's Lectures on Physics?

reference-request education

may 16 at 14:37 Nandhu 1

86

81

votes

22

answers

5

kviews

List of Interesting Math Videos/ Documentaries

soft-question big-list

may 10 at 4:14 cyclochaotic 396

8

12

votes

4

answers

486

views

Good book on evaluating difficult definite integrals (without elementary antiderivatives)?

reference-request integral improper-integrals

may 6 at 22:09 Argon 9,248

166

265

votes

115

answers

13

kviews

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

soft-question recreational-mathematics education big-list teaching

may 6 at 4:59 Jori Mäntysalo 31

7

10

votes

4

answers

949

views

Is there no solution to the “hardest” puzzle?

logic induction puzzle

may 5 at 5:39 keegan 1

27

43

votes

17

answers

1

kviews

The Best of Dover Books (a.k.a the best cheap mathematical texts)

reference-request education big-list

may 4 at 23:15 enthdegree 219

34

46

votes

17

answers

4

kviews

Striking applications of integration by parts

calculus big-list

may 3 at 13:19 DepeHb 485

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 11.8k

67

85

votes

40

answers

4

kviews

Funny identities

big-list

apr 29 at 6:07 John Marty 976

6

13

votes

5

answers

776

views

Probability of random integer's digits summing to 12

probability combinatorics contest-math

apr 26 at 15:48 Eric Jablow 486

16

30

votes

3

answers

2

kviews

Do you prove all theorems whilst studying?

soft-question intuition education self-learning learning

apr 24 at 2:09 Community♦ 1

56

148

votes

12

answers

42

kviews

Does Pi contain all possible number combinations?

number-theory pi

apr 21 at 15:32 mezhang 1,403

18

43

votes

12

answers

3

kviews

Conjectures that have been disproved with extremely large counterexamples?

big-list conjectures contradiction

apr 18 at 21:31 Joe K 121

3

13

votes

5

answers

506

views

What exactly is nonstandard about Nonstandard Analysis?

nonstandard-analysis

apr 17 at 21:21 Quinn Culver 2,431

101

176

votes

23

answers

7

kviews

Examples of apparent patterns that eventually fail

big-list examples-counterexamples

apr 10 at 3:04 Douglas B. Staple 1,014

21

43

votes

7

answers

1

kviews

Math and mental fatigue

soft-question

mar 31 at 15:20 Joachim 1,171

26

150

votes

10

answers

10

kviews

Is '10' a magical number or I am missing something?

number-theory number-systems

mar 29 at 21:38 BlueRaja - Danny Pflughoeft 2,889

13

40

votes

3

answers

711

views

Trying to define $\mathbb{R}^{0.5}$ topologically

general-topology

mar 29 at 18:06 mezhang 1,403

1

3

votes

2

answers

88

views

free group generated by polynomials

group-theory free-groups

mar 28 at 17:43 Alexander Gruber 15.1k

7

24

votes

19

answers

1

kviews

Mathematics understood through poems?

soft-question big-list popular-math

mar 28 at 15:13 Peter Shor 1,512

181

160

votes

23

answers

10

kviews

Proofs that every mathematician should know?

soft-question big-list

mar 25 at 0:36 Glen O 3,127

20

28

votes

13

answers

4

kviews

Anecdotes about famous mathematicians or physicists

math-history

mar 23 at 21:04 P.. 8,860

4

6

votes

3

answers

1

kviews

Which books would you recommend about Recreational Mathematics?

soft-question big-list reference-request recreational-mathematics

mar 18 at 11:07 learner 1,890

108

175

votes

8

answers

15

kviews

Is $dy/dx$ not a ratio?

calculus

mar 14 at 3:35 isomorphismes 845

25

43

votes

10

answers

4

kviews

Complex math problem that is easy to solve

soft-question

mar 13 at 6:26 Faust7 652

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 201

Gregor Bruns

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