arXiv:1405.3052 [math.AP]AbstractReferencesReviewsResources
Counterexamples to $ C^{\infty} $ well posedness for some hyperbolic operators with triple characteristics
Enrico Bernardi, Tatsuo Nishitani
Published 2014-05-13Version 1
In this paper we prove that for a class of non-effectively hyperbolic operators with smooth triple characteristics the Cauchy problem is well posed in the Gevrey 2 class, beyond the generic Gevrey class $ 3/2 $ (see e.g. \cite{Bro}). Moreover we show that this value is optimal.
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