Abstract
This paper studies the regularity of solutions of general, mixed, second-order, time-dependent, hyperbolic problems of Neumann type. In a previous paper [I. Lasiecka and R. Triggiani, Ann. Mat. Pura Appl. (IV) CLVII (1990), 285–367] using pseudo-differential calculus, we have provided sharp regularity results of the solutions and their traces, when the non-homogeneous data are in L2. Now, we complement this study by providing a regularity when the non-homogeneous data are more regular than, as well as less regular than, L2. In contrast with our previous paper, a functional analytic approach based on the L2-results of our previous paper is used throughout.
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