Abstract
In this paper we investigate the Cauchy problem for hyperbolic operators with double characteristics and hyperbolic operators of third order whose coefficients depend only on the time variable. And we give sufficient conditions for $C^{\infty}$ well-posedness.
Citation
Seiichiro Wakabayashi. "On the Cauchy problem for a class of hyperbolic operators whose coefficients depend only on the time variable." Tsukuba J. Math. 39 (1) 121 - 163, July 2015. https://doi.org/10.21099/tkbjm/1438951820
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