$L^\infty$ to $L^p$ constants for Riesz projections

Details $L^\infty$ to $L^p$ constants for Riesz projections $L^\infty$ to $L^p$ constants for Riesz projections

2010-05-11

arxiv.org/abs/1005.1842v1

Mathematics

Functional Analysis

Scientific paper

The norm of the Riesz projection from $L^\infty(\T^n)$ to $L^p(\T^n)$ is considered. It is shown that for $n=1$, the norm equals $1$ if and only if $p\le 4$ and that the norm behaves asymptotically as $p/(\pi e)$ when $p\to \infty$. The critical exponent $p_n$ is the supremum of those $p$ for which the norm equals $1$. It is proved that $2+2/(2^n-1)\le p_n <4$ for $n>1$; it is unknown whether the critical exponent for $n=\infty$ exceeds $2$.

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