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# A Necessary Condition for Multipliers of Weak Type $(1,1)$

Published:2001-03-01
Printed: Mar 2001
• Michał Wojciechowski
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## Abstract

Simple necessary conditions for weak type $(1,1)$ of invariant operators on $L(\rr^d)$ and their applications to rational Fourier multiplier are given.
 MSC Classifications: 42B15 - Multipliers 42B20 - Singular and oscillatory integrals (Calderon-Zygmund, etc.)