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Hagen von Eitzen

Bonn, Germany

von-eitzen.de/math/tntrep.xml

Age: 47

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

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Top Questions
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58
What exactly are eigen-things?
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46
Why do the French count so strangely?
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31
Integral solution for $|x | + | y | + | z | = 10$
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25
Does $ab=1$ imply $ba=1$ in a ring?
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25
Why is $\varphi$ called “the most irrational number”?
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23
Can every proof by contradiction also be shown without contradiction?
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23
There exist an infinite subset $S\subseteq\mathbb{R}^3$ such that any three vectors in $S$ are linearly independent.
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21
How to check if a point is inside a rectangle?
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21
Evaluating the infinite product $\prod_{k=2}^{\infty }\left ( 1-\frac{1}{k^2} \right ).$
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21
Why is $\frac{1}{\frac{1}{0}}$ undefined?
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20
Is Gödel's theorem invalid?
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19
Sequence Sum {1/2 + 1/4 + 1/6 +…} to infinite
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17
Prove that the set of $n$-by-$n$ real matrices with positive determinant is connected
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17
About the property of $m$: if $n < m$ is co-prime to $m$, then $n$ is prime
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16
Which infinity is meant in limits?
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15
Exactly half of the elements of $\mathcal{P}(A)$ are odd-sized
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15
How can I to solve $ \cos x = 2x$?
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15
Is it true that the book 'Calculate Primes' has found the pattern?
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15
What test can be used to show $\sum \dfrac{n!}{n^n}$ converges?
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14
$n|(n-1)!$ for all composite numbers $n>4,n\in \mathbb{N}$
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13
Probability problem: cars on the road
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13
Can all polynomials of a given degree be reducible?
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13
Show that $\pi \notin Q(\pi^3)$
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13
Are there real-life relations which are symmetric and reflexive but not transitive?
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13
Is it actually incorrect to say $x/1 = x$?
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13
Proving that if $f: \mathbb{C} \to \mathbb{C} $ is a continuous function with $f^2, f^3$ analytic, then $f$ is also analytic
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12
Limit $\lim_{x\to \infty } \, \frac{x}{\ln (x)-\ln \left(\frac{1}{x}\right)}$
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12
Are these sets equal?
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12
Maximum Value of the function $f(x)=x^n(1-x)^n$ for a natural number $n \geq1$ and $x\in[0,1]$.
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12
I have to think of a metric that makes (0,1) an unbounded interval
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