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 Oct 3 answered Why proof by induction is working. Oct 2 comment Determinant of a specially structured matrix Can't you put $\mathbf u:=\mathbf e$ and $\mathbf v:=b\mathbf e$ (or vice versa) to avoid the radicals? Oct 2 comment Is the subspace of $C_0$ open in $L^\infty$? +1 You managed to give the simplest argument of all of us :-) Oct 2 comment Is the subspace of $C_0$ open in $L^\infty$? Which metric you assume, the one of $L^\infty$, i.e., the maximum one, right? Oct 1 revised Show that max $\{f,g\}$ is continuous deleted 295 characters in body Oct 1 comment Finding the value of the series $(n-1)(n-2)(n-3)…\infty$ -1 This is way beyond acceptable notation. Remember that sloppiness in sums can lead to results like that $1+2+3+4+5+\dotsb = 1/12$. You need to very carefully specify what you do. Oct 1 answered Show that max $\{f,g\}$ is continuous Oct 1 awarded Yearling Sep 23 awarded Tumbleweed Sep 19 comment Why does the solution set for this inequality turn out this way? Ahem try this with a 5-variable inequality ;-) While this works on the "maternity school level", anywhere higher up you shall go the rigorous way. This answer is not quite general, it works only for 1-variable inequalities with continuous functions. Sep 14 comment Isolating Decimals Note that people who need this a lot often denote it $\{x\}\mathrel{:=} x-\lfloor x\rfloor$ (of course, they mention this notation in the preliminaries because it's considered non-standard). Sep 14 comment Why is Lebesgue so often spelled “Lebesque”? It's all because French has too complicated spelling :D Sep 13 comment Who decides after whom a theorem or conjecture is named? AFAIK, Berry's paradox was stated by Arnold :) Sep 8 revised limit calculation to infinity 123 improved formatting Sep 8 answered prove that $\forall N \in \mathbb{N}$, there is a $n\in N$ such that the prime gap $g_n = p_{n+1} - p_n$ > N. Sep 8 comment limit calculation to infinity 123 @lulu We seem to have submitted a similar edit simultaneously, but I don't have the edit privilege yet. Could you please check everything is ok? Feel free to reject my edit if it's better to do so. Sep 8 suggested approved edit on limit calculation to infinity 123 Sep 8 asked Canonical number systems reference request Sep 1 revised 1, 5, 9, 13, 17, 21,… edited body Sep 1 answered 1, 5, 9, 13, 17, 21,…