Skydreamer
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 Oct 14 accepted Sum of a nearly classic series Oct 14 asked Sum of a nearly classic series Sep 16 accepted Convergence of a series? Sep 16 revised Convergence of a series? added 1 characters in body Sep 16 comment Convergence of a series? Right, I was talking about $\sum u_n$ Sep 16 revised Convergence of a series? added 10 characters in body Sep 16 asked Convergence of a series? Sep 5 accepted Asymptotic analysis of a recurring sequence Sep 4 comment Prove that $\sqrt{a}\leq\frac{1+a}{2}$ Seems really nice though I can't understand why the line is $\sqrt{ab}$ long Sep 4 asked Asymptotic analysis of a recurring sequence Sep 4 comment Inequality proof on a sequence Thank you for the really clear answer ! Sep 4 accepted Inequality proof on a sequence Sep 4 asked Inequality proof on a sequence Sep 4 accepted Prove that $\sqrt{a}\leq\frac{1+a}{2}$ Sep 4 comment Prove that $\sqrt{a}\leq\frac{1+a}{2}$ Well, it was really simple... Sorry for the beginner's question. Sep 4 comment Prove that $\sqrt{a}\leq\frac{1+a}{2}$ No I don't already know this one. Sep 4 asked Prove that $\sqrt{a}\leq\frac{1+a}{2}$ Sep 4 awarded Yearling Jun 19 accepted Derivative of a composition Jun 19 comment Derivative of a composition This proof seems really nice. In fact, I tried it this way... But how do you expand $f\bigl(g(x)+hg'(x)+o(h)\bigr)$ ? (without any hypothesis on what function $f$ is)