Hagen von Eitzen
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382/400 score
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# 137,390 Reputation

260 today
 +55 9 hours ago 5 events Deducing that the inverse of a permutation matrix is its transpose +40 4 hours ago 4 events Cover a cicular hole with planks +35 11 hours ago 3 events Is it possible to replace $\lim$ by $\sup$ here? +25 6 hours ago 2 events For a field $K$ is $K\subset{K[X_{1},…X_{n}]}$ +20 3 hours ago 2 events Prove that $F=\left(-x^2+2\right)\cdot \cos\left(x\right)+2x\sin\left(x\right)$ don't have limit +20 11 hours ago 2 events Purely number theory problems +20 15 hours ago 2 events Power Series Problem… +15 2 hours ago 3 events Power to which 7 is raised to produce a number starting with 2015… +10 4 hours ago upvote can I draw a 2nd degree 2 dimensional surface trough 3x3 points, like I can draw a 2nd degree polynomial through any 3 points +10 9 hours ago upvote Prove that X=Y is equivalent to P(X)=P(Y),where X,Y are sets and P(X) is Set of X's all subsets.The same goes for P(Y0 +10 11 hours ago upvote Image of archimedean place of a number field in $\mathbb C$ 2 hours ago upvote Suppose $A$ is a subset of $B$ and $B$ is a subset of $C$ and $A$ is equinumerous with $C$. Prove $B$ is equinumerous with $C$. 2 hours ago upvote question regarding group permutation computation 3 hours ago upvote Chance that first 6 characters of a SHA-1 hash matching another SHA-1 hash? 3 hours ago upvote Finite abelian group - product of its elements
245 yesterday
 +162 / -2 14:56 19 events Is an empty parenthesis a valid mathematical expression? +15 23:28 accept Show that given a partial order there exists a total order +15 09:47 accept Are the connected components of the level sets of a $\mathcal{C}^1$ function path-connected? +15 00:12 accept Let $f:[0,\infty]\to R$ be differentiable on $(0, \infty)$, and $f'(x)\to b$ as $x \to \infty$. Show that $\lim_{x \to \infty}\frac{f(x)}{x}=b$ +10 10:39 upvote there doesn't exist any sequence of polynomials which converge to $\sin x$ uniformly on $\mathbb{R}$ +10 08:37 upvote How can a piece of A4 paper be folded in exactly three equal parts? +10 06:35 upvote Largest eigenvalues of AA' equals to A'A +10 03:40 upvote $f(x^2 + 1) = f(x)g(x)$ $\forall$ x $\in\mathbb{R}$ $\Rightarrow$ no. of roots of $f(x)=$?
210 2 days ago
 +35 14:55 3 events Roots of “almost cyclotomic” polynomials +35 06:12 3 events Is $f(x)$ reducible if $f(a)=0$ +20 17:28 2 events shown that f is even +20 15:28 2 events Proving $a + a = a$ if a statement is true +20 14:25 2 events Prove that $r$ is irreducible if and only if every divisor of $r$ is either a unit or an associate of $r$. +15 17:03 accept Word problem help? +10 18:09 upvote Continuous boundary of a convex set +10 18:02 upvote Question about the proof that $K(u)$ is isomorphic to $K(x)$ if u is transcendental over $K$. +10 16:08 upvote Show that the area of a triangle is given by this determinant +10 16:07 upvote question on the proof of uniqueness of completion +10 15:59 upvote Solutions for the following equation. +10 15:26 upvote Use of brackets around the integrand +10 06:56 upvote Are the connected components of the level sets of a $\mathcal{C}^1$ function path-connected? +10 02:30 upvote Does A5 have a subgroup of order 6? +15 / -15 20:33 2 events Follow-on question to “Fifty men and thirty woman…” -15 11:16 unaccept Two pawns walking in a complete graph
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