106,339 reputation
696194
bio website von-eitzen.de/math/tntrep.xml
location Bonn, Germany
age 48
visits member for 1 year, 10 months
seen 17 hours ago

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


Jul
8
answered Landau Constants precision
Jul
8
revised $[0, 1)$ and $S^1$ not homeomorphic?
deleted 2 characters in body
Jul
8
awarded  Guru
Jul
8
answered can a compact set have infinite measure?
Jul
7
awarded  Good Answer
Jul
7
answered Area of the Limiting Polygon
Jul
7
comment Area of the Limiting Polygon
The result is definitely not a circle. The edge midpoints of each intermediate polynomial will be on the limit figure, and already the next step, the 12gon, is irregular (has two different side lengths).
Jul
7
comment Area of the Limiting Polygon
The result is definitely not an ellipse (unless it is a circle), just think of the $120^\circ$ symmetry.
Jul
7
comment What is the limit of $nf(x+n)$ as $n\rightarrow \infty$? Here $f(x)$ is prob. density function.
$f(x+n)>\frac1n$ can happen only on a set of measure zero. Then again, $x+\mathbb Z$ might be this set.
Jul
7
answered Is the fact that there are more irrational numbers than rational numbers useful?
Jul
7
answered How many answers can be created using the elementary arithmetic operators?
Jul
7
comment How many answers can be created using the elementary arithmetic operators?
@Ellyjant There are of course some "unavoidable coincidences", such as $a-(b+c)=(a-b)-c$ or $a/(b/c)=c\times a/b$.
Jul
7
comment Determine if the following functions are multiplicative…
Do you consider that image readable?
Jul
7
awarded  Nice Answer
Jul
7
comment Problem 6 - IMO 1985
How is the sequence bounded? That depends on $x_1$, which is yet to be determined! For example $x_1>\frac{\sqrt 5-1}2$ leads to $x_2>1$ and from then on the sequnce diverges exponentially. - And monotonic depends on the choiice of $x_1$ as well. - Finally, I seem to have missed your definitions of $a_n, b_n$.
Jul
7
answered Why do people lose in chess?
Jul
7
comment Why do people lose in chess?
I've even see people lose in Tic Tac Toe unnecesarily ...
Jul
7
answered In a 2-connected simple graph, is there always a simple cycle containing any given path P and disjoint edge e?
Jul
7
answered prove ${a_n}$ is a Cauchy sequence, provided $a_{n+2} = \frac{a_n + a_{n+1}}{2}$
Jul
7
answered Lamport claims there is an error in Kelley's proof of the Schroeder-Bernstein theorem. What is it?