114,319 reputation
7106211
bio website von-eitzen.de/math/tntrep.xml
location Bonn, Germany
age 48
visits member for 2 years, 1 month
seen 2 hours ago

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


Nov
29
answered Creating rectangle on 3D plane
Nov
29
comment How prove this limit $\lim_{n\to\infty}\alpha_{n}=0$
This is obviously false in the case $d=1$.
Nov
29
comment How prove this limit $\lim_{n\to\infty}\alpha_{n}=0$
Anything after "then"?
Nov
29
answered Jargon: almost everywhere (or almost surely) on a subset
Nov
29
comment when fixed Point Iteration does not converge?
What are you iterating?
Nov
29
answered How to find the expresion such that its derivative must meet a certain condition
Nov
29
revised Prove $e^n$ and $\ln(n)$, mod 1, for $n=2,3,4…$ is dense in $[0,1]$
added 109 characters in body
Nov
29
answered Limit problem. Probability picking an item once out of M picks where p(pick) = 1/M+k.
Nov
28
answered Sums of squares
Nov
27
answered Is language context free?
Nov
27
reviewed Approve suggested edit on Why Are the Reals Uncountable?
Nov
27
reviewed Leave Closed In an infinite graph, is the length of a path with starting and ending nodes finite?
Nov
27
comment Show that every polytope is bounded
What is $x^*$ here? Since $0\le\lambda_i\le1$, you might also simply bound by $\left\|\sum_j\lambda_jx_j\right\|\le \sum_j|\lambda_j|\,\|x_j\|\le \sum_j |\lambda_j|M=M\sum_j \lambda_j=M$ where $M=\max\{\,\|x_j\|\colon 1\le j\le n\,\}$.
Nov
27
answered Prove that if f(x) is integrable, then so is e^(f(x)).
Nov
27
comment Line and a triangle never intersect at exactly 3 points - proof verification
You should elaborate more on betweenness as the claim is obviously false if we do not require the three points of intersection to lie between the vertices. (And which axiom system are you using in the first place? Euclid? Hilbert?)
Nov
27
comment Line and a triangle never intersect at exactly 3 points - proof verification
It is common to start from vertics $X_1$ etc. (and in fact call these $A,B,C$) instead of concluding their existence from nonparallelity of the edges ... This makes your argument a bit confusing
Nov
27
answered Does $\Bbb Q/ \Bbb Z$ have a proper subgroup that is not finite?
Nov
26
answered Strong induction proof with polygon
Nov
26
answered Irreducibility of a particular polynomial
Nov
26
comment Cosets & Groups.
Only different cosets are disjoint, $2+H$ and $4+H$ are the same coset.