Thomas Klimpel
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 Dec 16 reviewed Leave Open Can we always multiply some function that is not differentiable everywhere with function that is to obtain differentiable product? Dec 16 reviewed Leave Open Solution about a Michael Aschbacher exercise  Dec 16 reviewed Leave Open Is there a non-trivial cyclic quotient group of a non-cyclic group? Feb 23 reviewed Close an inequality in Banach algebra Feb 23 reviewed Leave Open Approximate the size of a set given random items from the set. Feb 23 reviewed Leave Open I want to find a topologicaly embedding $f : X \rightarrow Y$ and $g: Y \rightarrow X$, yet $X$ is not homeomorphic to $Y$. Feb 23 reviewed Leave Open Let $(X,d)$ be a compact metric space. Let $f: X \to X$ be such that $d(f(x),f(y)) = d(x,y)$ for all $x,y \in X$. Show that $f$ is onto (surjective). Feb 13 reviewed Leave Open Real Analysis, using Zorns Lemma Jan 26 reviewed Close Logic - how to write $\exists !x$ without the $\exists !$ symbol Oct 30 reviewed Approve How to prove this inequality $\frac{a_{1}a_{2}+a_{2}a_{3}+\cdots+a_{n-1}a_{n}}{a^2_{1}+a^2_{2}+\cdots+a^2_{n}}\le\cos{\frac{\pi}{n+1}}$ Oct 16 reviewed Approve coordinate geometry high level problems Oct 7 reviewed Approve infinitely many solutions to $\displaystyle x^n + y^n = z^{n+1}$ Jun 19 reviewed Looks OK $R[x]$ can be an integral extension of $R$? Jun 19 reviewed Reject For $R$-modules $M,N$, what are sufficient conditions for $\operatorname{Supp}(M\otimes_R N)\subseteq \operatorname{Supp}(\operatorname{Hom}_R(M,N))$? Jun 19 reviewed Reject Noetherian ring and prime ideal contained in an invertible maximal ideal. Jun 19 reviewed Leave Open 3 random numbers to describe point on a sphere Jun 19 reviewed Leave Open Ring of linear transformations modulo finite rank transformations Jun 19 reviewed Approve An elegant description for graded-module morphisms with non-zero zero component May 25 reviewed Approve Find a matrix $P$ that orthogonally diagonalizes $A$ and determine $P^{-1}AP$ May 13 reviewed Approve Continuous probability distribution with no first moment but the characteristic function is differentiable