Alexandre Eremenko
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92/100 score
 17h comment Why do we study symplectic geometry? It comes from mechanics. In classical mechanics there is a symplectic 2-form. Read Classical mechanics by Arnold. 17h answered Early examples of problems that are easier in high dimension Apr 26 answered On some curves of real values of a rational function Apr 26 comment “increasing” the logarithmic energy of certain measures @BigM: Fine. Now estimate the same from below and you will answer your question. Apr 25 answered Nelson's proof of Liouville's theorem Apr 25 answered Adapting arguments and plagiarism Apr 25 comment “increasing” the logarithmic energy of certain measures @Christian Remling: OK, then take $b$ very big:-) Apr 25 comment “increasing” the logarithmic energy of certain measures But the norm of this operator will be very big if $b$ is small. Your $b$ is not related to $a$, is it? Apr 25 comment “increasing” the logarithmic energy of certain measures There are smooth functions on $[0,b]$ with unit $L^2$ norm and arbitrarily large energy, so what is the question? Apr 24 answered Is there a $C_c^{\infty}( \mathbb{R}^d)$ function whose Fourier transform we can explicitly write down? Apr 22 comment Have some works by Émile Borel ever been translated from French to English or another foreign language? @Fabrice Pautot: I do not understand your last two remarks: you "do not validate" because nobody cared to translate the books you asked about? But this is not our fault:-) Apr 22 revised Have some works by Émile Borel ever been translated from French to English or another foreign language? added 274 characters in body Apr 22 comment The Zeta Function Before Riemann Weierstrass used $\zeta$ to denote something completely different, and this is a standard notation nowadays. Apr 22 awarded Nice Answer Apr 21 awarded Nice Answer Apr 21 comment What is the preimage of the Cassini oval under the stereographic projection? They are algebraic curves on the sphere whose equation is easy to write: just plug the stereographic projection to the equation of the plane curve. What exactly do you want to know about them? Apr 21 awarded Nice Answer Apr 20 answered Have some works by Émile Borel ever been translated from French to English or another foreign language? Apr 15 awarded Enlightened Apr 15 awarded Nice Answer