Proc. Japan Acad. Ser. A Math. Sci. 76 (4), 47-50, (April 2000) DOI: 10.3792/pjaa.76.47
KEYWORDS: initial boundary value problem, the regularity theorem, symmetric hyperbolic system, characteristic boundary, 35L50
The regularity theorem on the initial bounary value problem for linear symmetric hyperbolic systems with boundary characteristic of constant multiplicity is presented in an improved form. A complete proof based on the known results is given.