Download PDF by Tosio Kato: Abstract differential equations and nonlinear mixed problems

By Tosio Kato

The current article relies at the Fermi Lectures I gave in may perhaps, 1985, at Scuola Normale Superiore, Pisa, during which i mentioned numerous tools for fixing the Cauchy challenge for summary nonlinear differential equations of evolution variety. the following I current an in depth exposition of 1 of those equipment, which bargains with “elliptic-hyperbolic” equations within the summary shape and which has purposes, between different issues, to combined initial-boundary worth difficulties for definite nonlinear partial differential equations, comparable to elastodynamic and Schrödinger equations.

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4“';X o,yi} forms a CD-system, with stability constants depending only on sup{||5iiu(i)|b; i G /} . 1. 1), where we substitute for u a 33 ABSTRACT EVOLUTION EQUATIONS, ETC. given function w{t) G W and seek a solution v. Here the linear theory will be applied with the family A^(t) = A(w(t)) and the suhscale of {X j\Y j} of height s (see section 7). (b) Condition (N1) is rather implicit and complicated. It could be deduced from conditions related to higher order derivatives of F, but this will not necessarily simplify the matter.

5). 6b). 5) if we set Ws(t) = Cit)U\(t,0)ips^\. e. t). -i||o < if||V'»-i||o < K U l . 12). In fac it is a superposition of terms like the fourth term just considered. 14) Wj{t) = {\ + CU\)v)\-^j{t) t = + C{t) j Ui(t,T)wij(T)dT € 2fo). 5). -idr, 30 CHAPTER I which is of the same form as the term considered at the end of (d). 6b). 5). 4. - The case s = 1. 5) for s = 1. 17) v{t) = C/i(i,O)'0 , = 01 - A0 G X q. 17) makes sense and holds true (see [K4, K5]). 18) v \t) - v(t) = U[{t, O)(0' - 0) + (f/[(t, 0) - i/,(i, O))0.

In particular. 4) to compute dlA{w(t)) for w e W\I), it is necessary to extend the functions Pr to larger domains. This motivates introducing the following condition. 7) A :W ^ }=0 Lipschitz continuously. For 1 < r < s, the polynomial Pr has an extension such that ( 6 . 8) P r : VF X y* X . . X y ;+ i_ r ^ P i L {Y j+ r\X j) y=o Lipschitz continuously in o G W . e. t. We add three more assumptions. (N2) \\Aii>) - A(0)||,;o < m - ^111 where L is a constant. (N3) (ellipticity of A) For each ^ G VK, A(V>) is elliptic in the following sense.

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Abstract differential equations and nonlinear mixed problems by Tosio Kato


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