Arthur B.
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 Nov 4 answered Matrix equation with positive definite symmetric matrices Nov 4 asked Matrix equation with positive definite symmetric matrices May 12 asked Numerically stable calculation of multinomial probabilities May 6 awarded Announcer May 6 awarded Curious May 5 accepted Is there a probability distribution with mean $1$ such that $f(x)=\frac{1}{x}f\left(\frac{1}{x}\right)$ May 5 comment Is there a probability distribution with mean $1$ such that $f(x)=\frac{1}{x}f\left(\frac{1}{x}\right)$ It does not verify $f(x) = \frac{1}{x} f(\frac{1}{x})$, and it doesn't even have a finite integrale over $\mathbb{R}^+$ ?? May 5 revised Is there a probability distribution with mean $1$ such that $f(x)=\frac{1}{x}f\left(\frac{1}{x}\right)$ deleted 482 characters in body May 5 revised Is there a probability distribution with mean $1$ such that $f(x)=\frac{1}{x}f\left(\frac{1}{x}\right)$ added 133 characters in body May 5 revised Is there a probability distribution with mean $1$ such that $f(x)=\frac{1}{x}f\left(\frac{1}{x}\right)$ added 91 characters in body May 5 asked Is there a probability distribution with mean $1$ such that $f(x)=\frac{1}{x}f\left(\frac{1}{x}\right)$ Apr 17 accepted finite dimensional vector spaces of functions left invariant by translation Apr 16 comment finite dimensional vector spaces of functions left invariant by translation Assuming $f$ is differentiable, can we show every such subspace is spanned by $\{ e^{\lambda x} x^k \sin x, e^{\lambda x} x^k \cos x\}$ ? Apr 16 comment finite dimensional vector spaces of functions left invariant by translation I never claimed that those spaces spanned the entire space, this isn't the purpose. Apr 16 asked finite dimensional vector spaces of functions left invariant by translation Mar 17 comment Can you recommend a book to learn to teach math to a child? The book is for the teacher, not the child. And yes, that particular book is appropriate for your purpose. Think instead of patttern matching. Jan 7 comment Can you recommend a book to learn to teach math to a child? The full book seems available here: msri.org/people/staff/levy/files/MCL/Zvonkin.pdf Jan 7 comment Can you recommend a book to learn to teach math to a child? Wonderful, I actually posted an link to an excerpt of this book, but I didn't know what the book was. I think I actually may have had Dimitri as a "colleur" in 2000. Jan 7 accepted Can you recommend a book to learn to teach math to a child? Jan 7 awarded Nice Question