Initial-boundary value problems for hyperbolic systems in regions with corners. I
Initial-boundary value problems for hyperbolic systems in regions with corners. I
appear in the Kreiss condition for well-posedness, and indeed which appear in the analogous Lopatinskii condition for elliptic systems [8l.We shall, in a later paper, use the symmetrizer introduced here to obtain special cases of Kreiss' result in a simpler fashion.