By Kazufumi Ito, Franz Kappel

Offers an approximation idea for a basic type of nonlinear evolution equations in Banach areas and the semigroup concept, together with the linear, nonlinear, and time-dependent theorems. For researchers within the fields of research and differential equations and approximation idea.

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**Example text**

Assume that X* is uniformly convex and that A, B are mdissipative operators on X with dom A n dom B ^ 0. 32), A > 0. Then the following is true: a) xx is bounded for A > 0. 34) is bounded as A J, 0, then the equation y £ x - Ax - Bx has a unique solution x G dom An dom B and x = Iim^ox^. If for any y G X the corresponding family Bxxx is bounded as X 10, then A+B is m-dissipative. Chapter 1. Dissipative and Maximal Monotone 26 Operators Proof. Since X* is uniformly convex, the duality mapping F on X is singlevalued (cf.

B) If X is reflexive, then domA 0 = dom A Proof, a) Let x G domA 0 be given. 14 Ax is a closed convex subset of X. We choose 2/1,2/2 £ A°x, which implies \yi\ = \y%\ = infzeAx \z\. For any a G (0,1) we have ay\ + (1 - a)2/2 G Ax and \ay\ + (1 - a)y^\ < \yi\. By minimality of \yi\ we conclude that \ay\ + (1 — 0)2/2! = |j/i| = I2/2j- Since X is strictly convex, this implies 2/1 = 2/2b) We choose a; G dom A As in part a) of the proof we see that Ax is closed and convex. , we have lim \y„\ = \\Ax\\.

Another reference is [Die, Corollary 2 on p. 148], where it is proved that any weakly completely generated Banach space - reflexive Banach spaces are such spaces - has an equivalent norm such that X and X* are strictly convex. 5. Maximal monotone operators 39 assumptions of the theorem. Moreover, A + B is maximal monotone if A + B is. We choose x* £ X* and define the operator B : X —» X* by Bx = Bx + Fx - x*, x £ X. 36 for B. 36 that there exists an x G K such that (u - x, Fx + Bx - x* + v) > 0 for all [u, v] £ A.