106,269 reputation
696194
bio website von-eitzen.de/math/tntrep.xml
location Bonn, Germany
age 48
visits member for 1 year, 10 months
seen yesterday

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


Jul
14
awarded  Nice Answer
Jul
14
answered The “sides” of a k-regular bipartite graph are equal?
Jul
14
answered Infinite descent method and strong induction
Jul
14
comment Explaining Infinite Sets and The Fault in Our Stars
Also, the author says he wants to compare infinities, not subsets of $\mathbb R$
Jul
14
answered Explaining Infinite Sets and The Fault in Our Stars
Jul
14
comment Identifying topology
How does 10 fail to be a topology?
Jul
14
answered Identifying topology
Jul
14
comment What does $a = b$ mean when $a, b \in S$
The latter option makes little sense. If they are equal, they are not different
Jul
14
comment What is the cardinality of free product $\mathbb{Z} * \mathbb{Z}$?
The cardinality is the same as that of finite sequences of integers, henc ecountable
Jul
14
answered Is there a self-homeomorphism of the 2-sphere with exactly 3 fixed points?
Jul
13
answered Radius of $\sum a_n b_n x^n$ via radii of $\sum a_n x^n$ and $\sum b_n x^n$
Jul
13
answered The points $(0,0)$, $(a, 11)$, and $(b,37)$ are vertices of an equilateral triangle. Find the product $ab$.
Jul
13
answered Simulating a Six Sided Die with a Fair Coin
Jul
12
comment What's the best software for primality tests of huge numbers? (check if an integer is prime or not)
Support of multithreading will not be the tiebreaker between algorithms as that speed up at most by a constant factor
Jul
11
answered How to find irrational approximates
Jul
11
comment How to calculate line-length for fixed width koch fractal?
At each recursion level, divide the step length by 3. This is because f+f--f+f essentially moves by 3f (the gap in the middle and the two "detour" steps form an equilateral triangle)
Jul
11
answered vectors in a space (very simple question)
Jul
11
revised Primary school math regarding circles
added 148 characters in body
Jul
11
answered Primary school math regarding circles
Jul
11
comment Is there a prime between $k$ and $\dfrac{11}{9}k$, $\forall k\ge 24$?
@BalarkaSen Only for $n$ large enough and without being specific about "large enough"