Multipliers from Sobolev space $H^\al_p$ into $H^{-\al}_p$

Details Multipliers from Sobolev space $H^\al_p$ into $H^{-\al}_p$ Multipliers from Sobolev space $H^\al_p$ into $H^{-\al}_p$

2003-01-13

arxiv.org/abs/math/0301121v1

Mathematics

Functional Analysis

11 pages

Scientific paper

A function $q(x)$ is said to be a multiplier from the Sobolev space $H^\al_p(R^n)$ into $H^{-\al}_p(R^n)$ if the operator $Lf(x)=q(x)f(x)$ is a bounded operator from the first space into the second one. Let $M^\al_p$ the the space of such multipliers. In this paper we give the description of the spaces $M^\al_p$ provided the condition $\al>min(n/p,n/p')$. In the case $\al\le min(n/p,n/p')$ we obtain some embedding theorems for Sobolev spaces with negative smoothness indices into $M^\al_p$.

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