MathOverflow will be down for maintenance for approximately 3 hours, starting Monday evening (06/24/2013) at approximately 9:00 PM Eastern time (UTC-4).

 Jun12 answered What are some examples of mathematicians who had an unconventional education? Jun5 asked “Spectral decomposition” action on the unitary group Jun1 awarded ● Yearling May5 comment A sufficient condition for a probability measure to have compact support Yes, it does ! By any chance do you know if there is a similar characterization involving $C_\mu$ ? May5 revised A sufficient condition for a probability measure to have compact support added 70 characters in body May5 asked A sufficient condition for a probability measure to have compact support Apr27 comment What does the $q$-Catalan Numbers count?I'm not sure the $q$-Catalan numbers "count things", since they are not integers Apr19 comment Notation for a functional L2 matrix normWell, for finite dimensional spaces, like $2\times 2$ matrices, all norms are equivalent. Thus, chose your favorite norm on $2\times 2$ matrices (I'd chose the $\sup$ over the coefficients), and then take the $L^2$ norm (with respect to $z$) of it. That's what I'll use for $\|v\|_{L^2(\Sigma)}$. Mar3 comment What is a Gaussian measure?Hi Tom. At least for a real Banach space $X$, one may define a Gaussian measure $\gamma$ on $X$ by duality, that is a measure such that for any $f\in X^*$, $f_*\gamma$ is a (real) Gaussian measure. Maybe it does not help to much, but my point is that, for me, this is more about duality than projections. (see e.g. en.wikipedia.org/wiki/Abstract_Wiener_space) Feb26 comment Genus of Y^3 = X^4 - 1. "the genus" of a planar curve ? Jan11 answered Is there a (standard) name for $\bar{A}\setminus A$? Jan7 awarded ● Nice Answer Jan3 revised New grand projects in contemporary mathadded 183 characters in body Jan3 answered New grand projects in contemporary math