Thomas Klimpel
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 Apr 10 answered What does the term “undefined” actually mean? Mar 12 answered Maximal Principle: Why using the new transition matrix $\tilde{P}$? Mar 12 revised Maximal Principle: Why using the new transition matrix $\tilde{P}$? either always \tilde{p}, or never... Feb 23 reviewed Close an inequality in Banach algebra Feb 23 answered How do people who study intensely abstract mathematics “imagine” or understand the concepts they are studying or being taught? 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 22 answered Can every rational function be represented in barycentric form? Feb 21 comment Can every rational function be represented in barycentric form? @JohnHughes You mean because $y_j$ is not just a coefficient, but also identical to $r(x_j)$? Maybe you have a good point, and it could be related to my troubles understanding the cited statement. Feb 21 comment Can every rational function be represented in barycentric form? In Barycentric Lagrange Interpolation. Jean-Paul Berrut, Lloyd N. Trefethen., the earliest references seem to be from 1997 of Jean-Paul Berrut. This is a case of an author citing another paper of himself as reference, so "it is known" might only refer to a very small set of people... Feb 21 asked Can every rational function be represented in barycentric form? Feb 16 accepted Is the 3d Schwartz space isomorphic to a subspace of the 1d Schwartz space? Feb 16 revised Is the 3d Schwartz space isomorphic to a subspace of the 1d Schwartz space? Clarified the isomorphism means isomorphism of topological vector spaces, and added information I found in the meantime Feb 16 asked Is the 3d Schwartz space isomorphic to a subspace of the 1d Schwartz space? Feb 15 answered Notable examples of “impossible” results ruled out by earlier barrier or no-go theorems or widespread beliefs Feb 13 reviewed Leave Open Real Analysis, using Zorns Lemma Jan 26 reviewed Close Logic - how to write $\exists !x$ without the $\exists !$ symbol Dec 23 comment What's behind the Banach-Tarski paradox? The physical world doesn't deal with sets at all! Dec 19 awarded Constituent