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  • 5 votes cast
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?