Salvo Tringali
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 Apr8 answered Non-empty intersection between a compact and an unbounded connected subset of $\mathbb{R}^d$ Dec31 awarded Enlightened Dec31 awarded Nice Answer Dec6 awarded Yearling Dec6 awarded Yearling Aug10 comment Prove : $\frac{\cos(x_1) +\cos(x_2) +\cdots+\cos(x_{10})}{\sin(x_1) +\sin(x_2) +\cdots+\sin(x_{10})} \ge 3$ Af for your P.S., try with the tag \tag{put_here_a_label} at the end of your equations. Aug10 answered Is there a name for this identity involving series? Dec21 accepted Locally Lipschitz implies Lipschitz under equivalent metrics? Dec21 revised Locally Lipschitz implies Lipschitz under equivalent metrics? I had been too sloppy... Dec21 revised Locally Lipschitz implies Lipschitz under equivalent metrics? Addenda Dec21 asked Locally Lipschitz implies Lipschitz under equivalent metrics? Dec11 awarded Commentator Dec11 comment Neumann series in an incomplete normed algebra @Martin. I don't care much about labels but still think that normed ring/algebras would deserve their own tag. :) Dec11 revised Neumann series in an incomplete normed algebra Added example Dec11 comment Neumann series in an incomplete normed algebra I'm editing the OP to add an example. Dec10 comment Neumann series in an incomplete normed algebra As far as I can understand, there still exists no tag for normed algebras, and I'm not yet enabled to create a new one by myself. Dec10 asked Neumann series in an incomplete normed algebra Dec9 comment Find a closed term for $f(n) = n + 2 f(n-1)$, $f(1)=1$ @Mahoni. $f(n) = 2^n \cdot 2^{-n} f(n)$ for all $n \in \mathbb{N}^+$, right? Dec9 comment Correspondences between Borel algebras and topological spaces @JDH. It's your answer that is great. Dec7 comment Prove or disprove an equation about Euler's $\phi$ function Which can be conveniently shortened, under inspiration of André Nicolas' answer, recognizing that $\prod_{t \in \mathbb{P}} t^{(p-q)\;\! v_t(m)} = m^{p-q}$.