Skydreamer
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 Jul 12 comment Will the ball hit the wall? I unfortunately got a "This video has been blocked in your country" Jul 12 comment Will the ball hit the wall? Thanks for your answer ! Feb 1 comment How to maximize chances to win? Interesting explanation. Thanks ! Feb 1 comment How to maximize chances to win? Thank you for the help. Feb 1 comment How to maximize chances to win? Thank you ! I discovered this game a few days ago and was pretty interested in the math behind. Oct 14 comment Sum of a nearly classic series I changed the LHS. Sep 16 comment Convergence of a series? Right, I was talking about $\sum u_n$ 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 comment Inequality proof on a sequence Thank you for the really clear answer ! 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. 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) Jun 19 comment Derivative of a composition Yes, thank you for the precision ! Jun 7 comment Where does complex exponential come from? Thank you for the answer. This sounds now really clear to me. May 31 comment Sum of $\cos(k x)$ It was what I was looking for to go on. Thank you ! May 31 comment Sum of $\cos(k x)$ Thank you for your answer ! May 31 comment Sum of $\cos(k x)$ I get $\frac{\cos{x}-\cos{(n+1)x}+\cos{nx}-2}{2-2\cos{x}}$. It may be false though... May 31 comment Sum of $\cos(k x)$ It was a mistake in the question, the sum is on k and x is a variable. I edited it. Mar 13 comment Simplify arithmetic equation Interesting algorithm indeed. Mar 13 comment Simplify arithmetic equation That was the proof I was trying to find myself. Thank you !