Integral Remez inequalities for polynomials on convex bodies

Abstract

We denote as an integral Remez inequality an inequality of the form $$ \|f\|_{L^{1}(\mu)} \le C(\Omega,\mu(A), X) \|f\|_{L^{1}(\mu_{A})}, $$ where $\mu_A$ is the normalised restriction of a measure $\mu$ to a set $A$. Let $\mu$ be the uniform distribution over a convex body A and $f$ be a polynomial of degree $d$. One can choose $C$ independent of the dimension of the set A, in contrast with a classical $L^{\infty}$ Remez inequality.