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Weak observability estimates for 1-D wave equations with rough coefficients
In this paper we prove observability estimates for 1-dimensional wave equations with non-Lipschitz coefficients. For coefficients in the Zygmund class we prove a "classical" estimate, which extends the well-known observability ...
A note on complete hyperbolic operators with log-Zygmund coefficients
The present paper is the continuation of the recent work , and it is devoted to strictly hyperbolic operators with non-regular coefficients. We focus here on the case of complete operators whose second-order coefficients ...