Uniqueness of the Cauchy problem for a second order operator
Some uniqueness results for degenerate elliptic operators in two variables
Well-posedness of the Cauchy problem for a hyperbolic equation with non-Lipschitz coefficients
We prove that the Cauchy problem for a class of hyperbolic equations with non-Lipschitz coefficients is well-posed in and in Gevrey spaces. Some counter examples are given showing the sharpness of these results.
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