1. We describe, at first in a very formaI manner, our essential aim. n Let m be an op en subset of R, with boundary am. In m and on am we introduce, respectively, linear differential operators P and Qj' 0 i 'V. By "non-homogeneous boundary value problem" we mean a problem of the following type: let f and gj' 0 i 'v, be given in function space s F and G, F being a space" on m" and the G/ s spaces" on am"; j we seek u in a function space u/t "on m" satisfying (1) Pu = f in m, (2) Qju = gj on am, 0 i 'v-])). Qj may be identically zero on part of am, so that the number of boundary conditions may...

I. In this second volume, we continue at first the study of non homogeneous boundary value problems for particular classes of evolu tion equations. 1 In Chapter 4, we study parabolic operators by the method of Agranovitch-Vishik lJ; this is step (i) (Introduction to Volume I, Section 4), i.e. the study of regularity. The next steps: (ii) transposition, (iii) interpolation, are similar in principle to those of Chapter 2, but involve rather considerable additional technical difficulties. In Chapter 5, we study hyperbolic operators or operators well defined in thesense of Petrowski or...