Olga
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 Apr 12 awarded Commentator Apr 12 comment Can a sequence of functions with bounded derivative converge to something unbounded? You are so right and gosh was it so simple :|I am ashamed I didn't see it myself. Apr 12 asked Can a sequence of functions with bounded derivative converge to something unbounded? Dec 16 awarded Caucus Mar 25 comment How to prove Lyapounov stability of a circle orbit? @ABC, the definition is correct. Although I know it. I won't ask a question without knowing what I actually want to obtain. That's also why you shouldn't ask me to marry you. Mar 25 comment How to prove Lyapounov stability of a circle orbit? @Artem still, they can be close to a circle, even if the period depends on initial conditions? $\alpha=2$ is a harmonic oscillator, orbits are ellipses Mar 24 awarded Yearling Mar 24 awarded Self-Learner Mar 24 asked How to prove Lyapounov stability of a circle orbit? Dec 17 awarded Revival Dec 17 awarded Scholar Dec 17 accepted Why do Zoll metrics exist only on $S^2$ and $RP^2$? Dec 17 answered Why do Zoll metrics exist only on $S^2$ and $RP^2$? Oct 25 comment Why do Zoll metrics exist only on $S^2$ and $RP^2$? Rasmus, I updated a post after your comment. Yes, of course, I want to prove a fact which really holds. It's mentioned in lots of places in the litterature, in particular, in the book that I mentioned above which is considered a main book on this topic. Oct 25 revised Why do Zoll metrics exist only on $S^2$ and $RP^2$? added 229 characters in body Oct 25 asked Why do Zoll metrics exist only on $S^2$ and $RP^2$? Jul 24 awarded Autobiographer Oct 29 awarded Teacher Oct 21 answered Is there a map from a segment to a triangle? Oct 14 comment Is there a map from a segment to a triangle? Thank you very much for help! By the way, doest it follow, that diameters of the circle go to straight lines in hexagon from your argument?