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Contributions to Nonlinear Analysis: A Tribute to D.G. De Figueiredo on the Occasion of His 70th Birthday

Contributions to Nonlinear Analysis: A Tribute to D.G. De Figueiredo on the Occasion of His 70th Birthday (Hardback)

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This paper is concerned with the existence and uniform decay rates of solutions of the waveequation with a sourceterm and subject to nonlinear boundary damping ? ? u ?? u =|u| u in ? x(0,+?) ? tt ? ? ? ? u=0 on ? x(0,+?) 0 (1. 1) ? ? u+g(u)=0 on ? x(0,+?) ? t 1 ? ? ? ? 0 1 u(x,0) = u (x); u (x,0) = u (x),x? ? , t n where ? is a bounded domain of R ,n? 1, with a smooth boundary ? = ? ?? . 0 1 Here, ? and ? are closed and disjoint and ? represents the unit outward normal 0 1 to ?. Problems like (1. 1), more precisely, ? u ?? u =?f (u)in? x(0,+?) ? tt 0 ? ? ? ? u=0 on ? x(0,+?) 0 (1. 2) ? ? u =?g(u )?f (u)on? x(0,+?) ? t 1 1 ? ? ? ? 0 1 u(x,0) = u (x); u (x,0) = u (x),x? ? , t were widely studied in the literature, mainly when f =0,see[6,13,22]anda 1 long list of references therein. When f =0and f = 0 this kind of problem was 0 1 well studied by Lasiecka and Tataru [15] for a very general model of nonlinear functions f (s),i=0,1, but assuming that f (s)s? 0, that is, f represents, for i i i each i, an attractive force.

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