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Search options questions only not deleted user 12518
8 votes
1 answer
604 views

Violating the Lebesgue density theorem

Can anyone exhibit a finite-dimensional metric space (preferably, $R^d$) equipped with a measure that does not satisfy the conclusions of the Lebesgue Density Theorem? Such examples exist in infinite- …
Aryeh Kontorovich's user avatar
4 votes
0 answers
162 views

Are sums extremal for subgaussian concentration?

Bobkov and Houdre https://projecteuclid.org/euclid.bj/1178291721 showed that among all $f:R^n\to R$ that are $1$-Lipschitz with respect to the $\ell_1$ metric, the variance is maximized by sums. Namel …
Aryeh Kontorovich's user avatar
1 vote
1 answer
248 views

(Novel?) notion of concentration/dispersion

Consider the measurable space $(\Omega,\mathscr{B})$ endowed with two positive measures: a "volume $\nu$" and a probability measure $\mu$. For example, one might take $\Omega=\mathbb{R}^n$ (with the u …
Aryeh Kontorovich's user avatar