Abstract
This paper is devoted to the study of the Cauchy problem inC ∞ and in the Gevrey classes for some second order degenerate hyperbolic equations with time dependent coefficients and lower order terms satisfying a suitable Levi condition.
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Colombini, F., Ishida, H. & Orrú, N. On the Cauchy problem for finitely degenerate hyperbolic equations of second order. Ark. Mat. 38, 223–230 (2000). https://doi.org/10.1007/BF02384318
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DOI: https://doi.org/10.1007/BF02384318