Hagen von Eitzen

43,057 reputation

23494

bio	website	von-eitzen.de/math/tntrep.xml
	location	Bonn, Germany
	age	47
visits	member for	8 months
	seen	14 hours ago
stats	profile views	3,291

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

	43,057 reputation	bio	website	von-eitzen.de/math/tntrep.xml	visits	member for	8 months
23494 badges		location	Bonn, Germany		seen	14 hours ago

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1d	answered	How to write $\pi$ as a set in ZF?
2d	answered	Which numbers of [0,1) have a unique base g expansion?
2d	comment	Which numbers of [0,1) have a unique base g expansion? @Mat The WP article in fact only discusses the nonuniqeue expansions for $1$, but mentions also base 2 and 3 in "Generalizations". Other than that, think Mario's first comment could be taken as an answer.
2d	answered	Does Euler totient function gives exactly one value(answer) or LEAST calculated value(answer is NOT below this value)?
2d	comment	1 complex addition = 2 real additions? What could be cheaper than two additions? OK, one addition and something very cheap - so what is cheaper than one addition?
2d	answered	Finding Area of a shape
2d	answered	Does $P(A\cap B) + P(A\cap B^c) = P(A)$?
2d	answered	Equivalence classes
2d	answered	Bertrand's postulate in another point of view
2d	answered	Behaviour of $f$ in the neighbourhood of $c$ if $f'(c)= \cdots = f^{(n)}(c)=0$, and $f^{(n+1)}(c) \gt 0$
2d	answered	Regarding $\lim_{n \to \infty} n^{\frac{1}{n}}$
2d	answered	$\sum_{k=1}^n m(k)$, where $m(k)$ is defined by $2^{m(k)} \|\| k$.
2d	comment	Why does $3+ (-1)\left(\left\lfloor\sum_{k=1}^{\|\{x\in P,\;x\le n\}\|} \frac{P_k}{1-P_k}\right\rfloor\right) = \pi(n),\quad n\ge1223$? @JohnWO .. but the estimate $e^{e^r}$ is not necessarily exact. What we have is that $\sum_{p<n}\frac1p-\ln\ln n$ approaches the value $0.26149\ldots$ as $n\to\infty$
May 23	revised	Why does $3+ (-1)\left(\left\lfloor\sum_{k=1}^{\|\{x\in P,\;x\le n\}\|} \frac{P_k}{1-P_k}\right\rfloor\right) = \pi(n),\quad n\ge1223$? added 108 characters in body
May 23	answered	Why does $3+ (-1)\left(\left\lfloor\sum_{k=1}^{\|\{x\in P,\;x\le n\}\|} \frac{P_k}{1-P_k}\right\rfloor\right) = \pi(n),\quad n\ge1223$?
May 23	comment	Why does $3+ (-1)\left(\left\lfloor\sum_{k=1}^{\|\{x\in P,\;x\le n\}\|} \frac{P_k}{1-P_k}\right\rfloor\right) = \pi(n),\quad n\ge1223$? What's the differnce between "Why does ...?" and "Is there a way to prove this?"?
May 23	answered	Function generation by input $y$ and $x$ values
May 23	answered	Order of the largest cyclic subgroup of $\mathrm{Aut}(\mathbb{Z}_{720})$
May 23	reviewed	Approve suggested edit on Is there any easy way to simplify the following term?
May 22	comment	Inherently discrete concepts @leslietownes You are right, or no, maybe.