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 ? ???(0, +?) ? tt ? ? ? ? u=0 on ? ???(0, +?) 0 (1. 1) ? ? u+g(u)=0 on ? ???(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 ...
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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 ? ???(0, +?) ? tt ? ? ? ? u=0 on ? ???(0, +?) 0 (1. 1) ? ? u+g(u)=0 on ? ???(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? ???(0, +?) ? tt 0 ? ? ? ? u=0 on ? ???(0, +?) 0 (1. 2) ? ? u =?g(u )?f (u)on? ???(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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