106,274 reputation
696194
bio website von-eitzen.de/math/tntrep.xml
location Bonn, Germany
age 48
visits member for 1 year, 10 months
seen 2 hours ago

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


Jul
9
answered Given $a_{m*n} \leq a_m + a_n$, show that there exists $C$ such that $a_n \leq C log(n)$
Jul
9
answered What number does not belong to the following series?
Jul
9
answered Let $\mathbb Q\le K$ finite extension of fields $\alpha\in K$. Then $N(\alpha)=\pm1\Leftrightarrow\alpha$ is a unit
Jul
9
awarded  Nice Answer
Jul
9
answered What is an instance of a mousetrap proof?
Jul
9
answered Show that $(x_1\times\dots\times x_k)\times x_{k+1}=x_1\times\dots\times x_{k+1}$
Jul
8
comment Has the Gödel sentence been explicitly produced?
There is of ocurse no full warranty of correctness. But interestingly, the latin alphabet was just long enough to supply enough variables ;)
Jul
8
answered Has the Gödel sentence been explicitly produced?
Jul
8
comment Prove that there is only one way to make a square using all six tangram pieces
@jlandercy's remark makes this a finite problem, so it can at least be tackled by a computer: One can show that all piece edges must lie on a few horizontal, vertical, diagonal grid lines; hence each piece can occupy only finitely many positions.
Jul
8
comment Is there a total disconnect between two Zermelo Theorems?
There is no overwhelming relation between the several Cauchy theorems, either
Jul
8
answered Help with Monbukagakusho mathematics exams questions.
Jul
8
comment What's the value of Epsilon?
I assume the "interval of trust" $[h-\epsilon,h+\epsilon]$ is given elsewhere in the form $[a,b]$. Then $\epsilon = \frac{b-a}2$.
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.