Mathematisches Institut, Fakultät für Mathematik und Informatik, Friedrich-Schiller-Universität, Leutragraben 1, 07743 Jena, Germany malarski@minet.uni-jena.de
Abstract: The aim of the talk is to present some regularity properties for solutions of the wave equation in $B^s_{p,q}$ with $p<1$. Up to now no such result has been known. For $p\ge 1$ a large amount of work has been done, c.f. for instance Peral, Seeger, Sogge and Mockenhaupt. The results in this paper for $p>1$ are not optimal, which can be seen comparing them with Peral's result. Whether or not our results are optimal for $p\le 1$ is open.
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