Hagen von Eitzen
Reputation
196,509
992/1000 score
13 189 359
Impact
~2.4m people reached

# 196,509 Reputation

145 yesterday
 +35 20:46 3 events Integer solutions to $x^3+y^3+z^3 = x+y+z = 8$ +30 14:45 3 events $A$ is a complex nilpotent $15X15$ matrix of order 5 ($A^5=0$), $\operatorname{rank}(A)=10$, $\operatorname{rank}(A^3)=4$. Find all possible JCFs +25 06:58 2 events How do I prove that for a random variable $X$, we have $P(X \le a) \le p$? +15 00:00 accept Proving set theory subsets using element argument +10 23:17 upvote Primes and squares +10 21:06 upvote Why can the sieve of eratosthenes not be used to confirm the twin primes conjecture? +10 18:03 upvote Does every bijection of $\mathbb{Z}^2$ extend to a homeomorphism of $\mathbb{R}^2$? +10 10:42 upvote Why is empty set an open set?
75 2 days ago
 +15 10:54 accept If $K\leq H\leq G$ (not necessarily finite groups). Then prove that $[G:K]=[G:H]\cdot [H:K]$ +10 16:34 upvote How do I go about proving that an even function about x=0 has a derivative of 0? +10 15:36 upvote Ultrafilter closed under negative shift +10 11:36 upvote Convex set or not? +10 10:17 upvote Is $\emptyset$ considered as a powerset by itself? +10 10:12 upvote Why do injective holomorphic functions have nonzero derivative +10 07:45 upvote Equivalence of strong and weak induction
86 Jul 23
 +30 13:14 3 events Existence of such a meromorphic function? +20 14:39 2 events Prove without differentiation that $\log_{n+1}n$ is increasing +10 19:21 upvote Monotonicity of the sequence $(a_n)$, where $a_n=\left ( 1+\frac{1}{n} \right )^n$ +10 15:41 upvote $\sum_{k=0}^n k \binom{n}k=n\cdot2^{n-1}$ +10 05:21 upvote Why is empty set an open set? +10 / -2 18:56 2 events How to prove if this $\sum_{l=0}^{n}\binom{n}{l}=2^{n}$ is valid for all $n\in \mathbb{N}$? -2 14:53 downvote Prove that $G$ has a element whose order is least common multiple of $m$ and $n$.
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