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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