In an earlier work we have proved some estimates of Strichartz type for second order hyperbolic operators with C s coefficients for 0 ≤ s ≤ 1. Here we improve these estimates and extend the range of s to 0 ≤ s ≤ 2. In particular for s = 2 we obtain the full Strichartz estimates.
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Daniel Tataru (2001) studied this question.
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