Hagen von Eitzen
Reputation
188,782
97/100 score
 1d revised Why is $R((X))$ defined as follows? added 507 characters in body 1d revised Are 0 and -1 the only rational periodic solutions of $z_{n}\equiv z_{n-1}^{2}+c$? added 10 characters in body 2d revised Why is $R((X))$ defined as follows? added 253 characters in body 2d revised Is the series $\sum_{n=1}^\infty\frac{n^n}{n!e^n}$ divergent? added 766 characters in body 2d revised Is the series $\sum_{n=1}^\infty\frac{n^n}{n!e^n}$ divergent? added 766 characters in body May 1 revised Why formulate continuity in terms of pre-images instead of image? added 18 characters in body Apr 30 revised Prove that there exists no prime added 7 characters in body Apr 29 revised A bipartite graph like $G(X,Y)$ such that $|X|=|Y|=k$ and $\delta(G) \gt \frac {k}{2}$ is Hamiltonian. added 21 characters in body Apr 28 revised Show that $\left | \sum_{k=1}^{m}a_k - \sum_{m+1}^{n}a_k \right| \leq \max|a_k|$ edited body; edited title Apr 25 revised The $\cos(\alpha-\beta)$ formula always need $\alpha > \beta$ or not? deleted 1 character in body Apr 24 revised Algebraic description of $\frac1{x+y}$ in terms of $\frac1x$ and $\frac1y$ over finite field. added 951 characters in body Apr 24 revised Algebraic description of $\frac1{x+y}$ in terms of $\frac1x$ and $\frac1y$ over finite field. added 2 characters in body; edited title Apr 24 revised Creating a linear transformation $T$ such that $T$ is invariant in a proper subspace but not normal added 4 characters in body Apr 23 revised How to define such a non-constant, continuous $f(x)$ on $[a,b] \subset \mathbb R$ edited body Apr 23 revised $0^0$ is undefined, but sometimes defined as $1$? added 181 characters in body Apr 22 revised Assuming $0 \leq a_{n+1} \leq c_n a_n + b_n$ (+ other conditions), show $a_n \to 0$ added 29 characters in body Apr 22 revised Why is a polynomial $f(x)$ sum of squares if $f(x)>0$ for all real values of $x$? edited body Apr 22 revised Prove continuity of a function from $S^n$ to $\Bbb R^n$ added 15 characters in body Apr 19 revised Summation over a floor function of a first degree polynomial added 11 characters in body Apr 19 revised Find the product of $f(x)$ and $g(x)$ given one of them added 143 characters in body