Dennis Gulko
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 Apr 20 awarded Popular Question Feb 12 awarded Yearling Sep 14 awarded Enlightened Sep 14 awarded Nice Answer Aug 10 comment combinations groups question It's a variation of Kirkman's schoolgirl problem: en.wikipedia.org/wiki/Kirkman%27s_schoolgirl_problem Aug 10 reviewed No Action Needed Approximating $\pi$ by an expression of the form $\sqrt{\sqrt{ \cdots \sqrt{ n!! \cdots !}}}$ Aug 10 revised Is my proof for this fact correct? added 36 characters in body; edited tags; edited title Aug 7 reviewed Approve analytic-continuation tag wiki Aug 7 reviewed Approve fuzzy-set tag wiki Aug 7 reviewed Approve Origin of the terminology “Completeness” in R Aug 7 reviewed Approve fuzzy-set tag wiki excerpt Aug 4 reviewed Looks OK Determining if function odd or even Jul 26 reviewed Leave Closed $|g(x)| \leq K \int_a^x|g| \ \ \forall x \in I$ Jul 23 reviewed Reopen Show that $f(z)\not=0, \forall z\in \mathbb C$. Jul 23 reviewed Reviewed How to calculate combinations count for this problem Jul 23 revised How to calculate combinations count for this problem added 73 characters in body Jul 21 reviewed Looks OK How do I explain 2 to the power of zero equals 1 to a child Jul 20 reviewed Leave Closed Three knights on a 3x3 chess board Jul 20 reviewed Approve Non empty perfect set in $\mathbb{R}$ which has no rational points Jul 11 comment Solve $\frac{\tan^3\theta}{1+\tan^2\theta}+\frac{\cot^3\theta}{1+\cot^2\theta} = \sec\theta\csc\theta - 2\sin\theta\cos\theta$ @Akshansh Bhura: Welcome to math.SE: since you are new, I wanted to let you know a few things about the site. In order to get the best possible answers, it is helpful if you say in what context you encountered the problem, and what your thoughts on it are; this will prevent people from telling you things you already know, and help them give their answers at the right level. When its a homework question, please use the 'homework' tag. People will still help, don't worry! Consider editing you question