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• #### A well-posedness result for hyperbolic operators with Zygmund coefficients ﻿

(2013-12-31)
In this paper we prove an energy estimate with no loss of derivatives for a strictly hyperbolic operator with Zygmund continuous second order coefficients both in time and in space. In particular, this estimate implies the ...
• #### Time-Dependent Loss of Derivatives for Hyperbolic Operators with Non Regular Coefficients ﻿

(2013-12-31)
In this paper we will study the Cauchy problem for strictly hyperbolic operators with low regularity coefficients in any space dimension N ≥ 1. We will suppose the coefficients to be log-Zygmund continuous in time and ...