Hagen von Eitzen
Reputation
97/100 score
 1h answered Find a close form expression for $f(x)$ 6h answered Epsilon delta theorem proof 8h asked How to pronounce “$a:b=c:d$” in English? 19h answered Random points on a sphere — expected angular distance 2d answered $\lim_{x\rightarrow a} f(x)= \lim_{x\rightarrow a} [f(x)]$ then at $x=a$ is there a maxima or minima? 2d answered $f(x)=\sum_{k=0}^\infty c_kx^k$ converges for $|x|0$, $\exists x_n\ne0$ s.t. $x_n\to0$, $f(x_n)=0$ $\forall n$, then $c_k=0$ $\forall k$. 2d answered What is an axiom in layman's terms? 2d answered Are 0 and -1 the only rational periodic solutions of $z_{n}\equiv z_{n-1}^{2}+c$? 2d answered Why is $R((X))$ defined as follows? 2d answered Is the series $\sum_{n=1}^\infty\frac{n^n}{n!e^n}$ divergent? May 2 answered Show that $\sin(x) > \ln(x+1)$ for any $x \in (0,1)$ May 1 answered Is $\Bbb Q[x]/(x^2+x)$ isomorphic to $\Bbb Q[x]/(x^2-x)$? May 1 answered What is the logic underlying this proof? May 1 answered Prove that $a . g = g^{-1}.a$ and $g . a = a . g^{-1}$ hold for any group and any action defined. May 1 answered How to differentiate something with u and x? Apr 30 answered Is there a way to see if $\alpha \in \mathbb{C}$ is constructible at a glance? Apr 30 answered Minimal 4-regular planer graph Apr 30 answered How to convert arccos to arctan? Apr 30 answered Prove that there exists no prime Apr 29 answered Find all function that satisfy $(f(x) + xy) \cdot f(x - 3y) + (f(y) + xy) \cdot f(3x - y) = (f(x + y))^2$