HenrikRueping
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 Jun 2 comment Homotopy equivalence between finite, discrete topological spaces. Without those words: If you count the number of path components, you get that a discrete space with m elements has exactly m path componentsand the number of path components is invariant under homotopy equivalence. May 27 answered If there is a finite-closed topology on $X$ with 3 clopen elements, then $X$ is finite May 27 comment At which points is the following function differentiable I wonder whether it is possible to choose other functions of $q$ (than $q^n$) so that the answer depends on the degree of the minimal polynomial of $x$... May 27 comment At which points is the following function differentiable I guess you meant $q^n|x-p/q| \rightarrow \infty$ as $p/q \rightarrow x$ (that is the denominator of the term whose limit gives the derivative). May 26 asked At which points is the following function differentiable May 7 awarded Nice Question Jan 28 awarded Popular Question Dec 9 awarded Caucus Oct 29 comment What happens if you follow the sun? Usually Iwould also expect that you would go a little bit west every day. In the morning, you go east towards the sun and thus reach the point where the sun is directly above you some seconds before Mid-day. Then for the rest of the day you would go east. So every day you got a bit more to the west then to the east. Jul 22 awarded Yearling Jul 21 revised Prove or disprove: if a set of 2d-points have symmetry axises, then at least one of the axises is eigenvector added 199 characters in body Jul 21 revised Prove or disprove: if a set of 2d-points have symmetry axises, then at least one of the axises is eigenvector added 372 characters in body Jul 21 answered Prove or disprove: if a set of 2d-points have symmetry axises, then at least one of the axises is eigenvector Jul 2 awarded Curious Jun 3 accepted Number of surjections with injective restrictions Jun 2 revised Number of surjections with injective restrictions added 223 characters in body Jun 2 comment Number of surjections with injective restrictions @Bananarama: NO I think it is correct. Hopefully my edits will make this clear. Jun 2 asked Number of surjections with injective restrictions Feb 21 accepted Accumulation points of uncountable sets Feb 21 revised Accumulation points of uncountable sets edited body