User Gregor Bruns - Mathematics Stack Exchange

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	location	Leipzig, Germany
	age	25
visits	member for	1 year
	seen	yesterday
stats	profile views	140

	1,107 reputation	bio	website	n/a	visits	member for	1 year
1414 badges		location	Leipzig, Germany		seen	yesterday

12

40

votes

1

answer

1

kviews

Does $|n^2 \cos n|$ diverge to $+\infty$?

sequences-and-series conjectures

apr 3 '12 at 21:22 Hurkyl 21.6k

13

40

votes

3

answers

720

views

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

general-topology

mar 29 at 18:06 mezhang 1,433

33

36

votes

19

answers

3

kviews

Mathematical subjects you wish you learned earlier

soft-question learning

feb 13 at 23:19 andyvn22 101

8

35

votes

4

answers

2

kviews

“Closed” form for $\sum \frac{1}{n^n}$

sequences-and-series

feb 25 '12 at 17:30 Peter Tamaroff 26.2k

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

13

29

votes

6

answers

716

views

Original works of great mathematicians

reference-request math-history big-list

nov 2 at 0:06 Ravindra Saraykar 1

20

29

votes

3

answers

2

kviews

What is the Tor functor?

commutative-algebra modules homological-algebra derived-functors

jul 24 at 7:17 Matt N. 15.3k

20

28

votes

13

answers

4

kviews

Anecdotes about famous mathematicians or physicists

math-history

mar 23 at 21:04 P.. 8,945

7

25

votes

19

answers

1

kviews

Mathematics understood through poems?

soft-question big-list popular-math

mar 28 at 15:13 Peter Shor 1,512

9

25

votes

7

answers

2

kviews

Are the exercises necessary to understand the subject of a mathematical textbook?

soft-question self-learning

aug 19 at 8:03 Holdsworth88 3,470

5

23

votes

2

answers

853

views

Proof that a natural number multiplied by some integer results in a number with only one and zero as digits

number-theory algorithms

nov 21 '11 at 3:03 Quinn Culver 2,446

14

21

votes

3

answers

670

views

Good ways to help people learn math.

soft-question education

jul 27 at 15:59 Dani 103

8

21

votes

1

answer

422

views

Is $\sin\left(\frac{\pi}{2}\sin\left(\frac{\pi}{2}\cdots\sin x\cdots\right)\right)=\frac4{\pi}\sum\limits_{k=0}^\infty\frac{\sin(2k+1)x}{2k+1}$?

sequences-and-series recurrence-relations fourier-series

aug 28 at 11:38 Ilies Zidane 776

18

21

votes

2

answers

2

kviews

What do eigenvalues have to do with pictures?

linear-algebra eigenvalues eigenvectors image-processing

may 19 at 12:43 J. M. 39k

10

21

votes

3

answers

905

views

Guaranteed Checkmate with Rooks in High-Dimensional Chess

combinatorics geometry puzzle recreational-mathematics combinatorial-game-theory

nov 13 at 20:14 Community♦ 1

19

21

votes

9

answers

3

kviews

A really complicated calculus book

calculus reference-request differential-geometry algebraic-topology

feb 26 at 11:48 Dave Hartman 548

2

20

votes

7

answers

664

views

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

linear-algebra combinatorics generating-functions fibonacci-numbers

may 19 at 10:40 Martin Sleziak 20.3k

7

20

votes

2

answers

341

views

Random walk: police catching the thief

probability random-walk

sep 1 at 23:58 drhorrible 16

6

20

votes

2

answers

575

views

Is the fundamental theorem of calculus independent of ZF?

calculus functional-analysis logic set-theory banach-spaces

aug 22 at 4:39 Alexander Shamov 1,421

12

20

votes

5

answers

803

views

Does $G\cong G/H$ imply that $H$ is trivial?

group-theory

jan 31 at 11:23 user1729 3,364

5

18

votes

8

answers

465

views

Contemporary Mathematical Columns in Magazines

recreational-mathematics

oct 18 at 16:09 Joseph Malkevitch 3,552

9

17

votes

6

answers

794

views

Why should I care about fields of positive characteristic?

abstract-algebra field-theory

aug 17 '10 at 22:50 Andrea Mori 8,674

5

17

votes

1

answer

589

views

Expressing $2002^{2002}$ as a sum of cubes

number-theory

jun 27 '12 at 3:43 Alex Hirzel 223

2

17

votes

4

answers

285

views

What are the zero divisors of $C[0,1]$?

real-analysis abstract-algebra ring-theory

jun 9 '12 at 10:10 Georges Elencwajg 45k

11

16

votes

5

answers

990

views

Prove that every number ending in a $3$ has a multiple which consists only of ones.

elementary-number-theory proof-strategy

jul 2 at 14:04 lab bhattacharjee 29.3k

3

16

votes

3

answers

192

views

Find all polynomials that fix $\mathbb Q$ and the irrationals

polynomials problem-solving

dec 20 at 3:41 Yury 3,368

16

votes

6

answers

673

views

How to go from beginner to expert in mathematics?

education online-resources

jan 18 at 3:55 Levi Fioravanti 1

14

15

votes

2

answers

336

views

History of Modern Mathematics Available on the Internet

reference-request math-history

jun 8 '12 at 18:07 Holdsworth88 3,470

4

14

votes

7

answers

513

views

Why do the reals need to be constructed? Do they somehow “span” the rationals, the roots, and the transcendentals like e and pi?

real-analysis analysis

jan 19 at 14:10 Michael E2 676

4

14

votes

6

answers

596

views

Is the set of real numbers the largest possible totally ordered set?

real-analysis order-theory

feb 10 at 3:41 Haskell Curry 11.1k

Gregor Bruns

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