Hagen von Eitzen

Bonn, Germany

http://www.von-eitzen.de/math/tntrep.xml

I did study math and had a knack for it, but I am sooo out of that business now ...

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Connected metric spaces with disjoint open balls

metric-spaces connectedness asked Sep 13, 2012 at 22:01

math.stackexchange.com

27 votes

Does path-connected imply simple path-connected?

general-topology connectedness path-connected asked Nov 10, 2015 at 16:16

math.stackexchange.com

21 votes

If $f(x)\to 0$ as $x\to\infty$ and $f''$ is bounded, show that $f'(x)\to0$ as $x\to\infty$

real-analysis asked May 19, 2013 at 21:51

math.stackexchange.com

17 votes

How to pronounce "$ a:b=c:d$" in English?

pronunciation asked May 5, 2016 at 8:41

math.stackexchange.com

16 votes

Schreibung von (Klammer-)Ergänzungen

compounds typography asked Jan 18, 2014 at 19:21

german.stackexchange.com

13 votes

Gegenteil von Abkürzung

abbreviations antonyms asked Apr 29, 2016 at 8:38

german.stackexchange.com

13 votes

PDFs want to scale down

pdftex pdf paper-size adobe asked Oct 6, 2014 at 13:51

tex.stackexchange.com

12 votes

Prove that $e^n\bmod 1$ is dense in $[0,1]$

real-analysis asked Nov 18, 2020 at 15:55

math.stackexchange.com

12 votes

Systematic solution to my soccer ball puzzle

geometry puzzle symmetry asked Oct 4, 2015 at 15:08

math.stackexchange.com

11 votes

Construct quadrangle with given angles and perpendicular diagonals

geometry alternative-proof geometric-construction asked Dec 8, 2014 at 11:54

math.stackexchange.com

Top Answers

358

How can a piece of A4 paper be folded in exactly three equal parts?

math.stackexchange.com

243

Why is empty set an open set?

math.stackexchange.com

175

Can you be 1/12th Cherokee?

math.stackexchange.com

134

Is tipping mandatory at Restaurants and Bars in Germany?

travel.stackexchange.com

102

Why do people lose in chess?

math.stackexchange.com

100

What exactly are eigen-things?

math.stackexchange.com

How do I convince my students that the choice of variable of integration is irrelevant?

math.stackexchange.com

Why is the determinant the volume of a parallelepiped in any dimensions?

math.stackexchange.com

How to prove that a $3 \times 3$ Magic Square must have $5$ in its middle cell?

math.stackexchange.com

Possible to add MIME type to web.config without possibly breaking the site?

stackoverflow.com

Can two figures have the same area, perimeter, and same number of segments have different shape?

math.stackexchange.com

How can one prove that $e<\pi$?

math.stackexchange.com

Irreducible polynomial which is reducible modulo every prime

math.stackexchange.com

What's so special about characteristic 2?

math.stackexchange.com

How can I answer this Putnam question more rigorously?

math.stackexchange.com

Largest prime number with all digits different

math.stackexchange.com

Why do the French count so strangely?

math.stackexchange.com

Quickest way to determine a polynomial with positive integer coefficients

math.stackexchange.com

Are there any Mersenne primes, besides 3, that end in 3

math.stackexchange.com

Property of 111,111

math.stackexchange.com

Why is $\varphi$ called "the most irrational number"?

math.stackexchange.com

How can you show Godel's incompleteness theorem using mathematical symbols?

math.stackexchange.com

Cover of "Gödel, Escher, Bach"

math.stackexchange.com

counting the number of elements in a conjugacy class of $S_n$

math.stackexchange.com

Nested radicals of 1000 square roots

math.stackexchange.com

Rigour in mathematics

math.stackexchange.com

Can every proof by contradiction also be shown without contradiction?

math.stackexchange.com

Why are continuous functions not dense in $L^\infty$?

math.stackexchange.com

Do we have negative prime numbers?

math.stackexchange.com

If a group $G$ has odd order, then the square function is injective.

math.stackexchange.com