Hagen von Eitzen

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23494
bio website von-eitzen.de/math/tntrep.xml
location Bonn, Germany
age 47
visits member for 8 months
seen 8 hours ago
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I did study math and had a knack for it, but I am sooo out of that business now ...


1,768 Answers

newest activity votes
7
Find the minimum of $q$.
7
Proof of the inequality $1+1!+\frac{1}{2!}+\cdots+\frac{1}{n!} >\left( 1+\frac{1}{n}\right)^n$
7
Give an example of a bounded, non-convergent real sequence $(a_n)$ s.t. $a_n-a_{n-1}\rightarrow 0$
7
Generating Functions- Closed form of a sequence
7
Simplify $\sum_{i=0}^n (i+1)\binom ni$
7
Examples of nonabelian groups.
7
Is it significant that factorials have more trailing zeros as they get higher?
7
A limit without Taylor series or l'Hôpital's rule $\lim_{n\to\infty}\prod_{k=1}^{n}\cos \frac{k}{n\sqrt{n}}$
7
The largest term in the sequence $x_n=\frac {1000^n}{n!}$ for $n=1,2,3,…$
7
How many permutations $\pi$ of $\{1,2,…,n\}$ are there such that $|\pi (i) - i|\le 1$?
7
Wrong Wolfram|Alpha limit?
7
Why isn't this a valid argument to the “proof” of the Axiom of Countable Choice?
7
$\{x_n\}$ be a bounded sequence of real number we need to show
7
Logarithm problem
7
It's in my hands to have a surjective function
7
Prove $\sqrt[n]{n}\leq 1+\frac{2}{\sqrt{n}}$
7
Give an example of two closed sets $A, B \subseteq \mathbb{R}$ such that the set $A + B $ is not closed
7
How can I prove that the value of this series is smaller than a constant c < 1
7
What is the number of real roots of the polynomial?
7
Unusual pair of dice
7
Why is $x^2 \pmod{16}$ always $0, \ 1,\ 4,\ 9$?
7
Given $f(x+1/x) = x^2 +1/x^2$, find $f(x)$
7
Find the possible values of $a$, $b$ and $c$?
7
How to round 0.4999… ? Is it 0 or 1?
7
If a sequence satisfies $\lim\limits_{n\to\infty}|a_{n+1} - a_n|=0$ then the set of its limit points is connected
7
Abstract manifolds or do we need an ambient space?
7
Evaluating $ \lim\limits_{n\to\infty} \sum_{k=1}^{n^2} \frac{n}{n^2+k^2} $
7
how to be good at proving?
6
maximum number of edges to be removed to possess a property
6
Do there exist functions satisfying $f(x+y)=f(x)+f(y)$ that aren't linear?
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