Periodic Solutions of Nonlinear Wave Equations
نویسنده
چکیده
where f is a given continuous function in R 3 and f is T-periodic in t and s. Periodic solutions of nonlinear hyperbolic partial differential equations have been studied extensively in the recent years [1, 6, 7, 8, 9, 10, 11, 12, 13, 14]. The two approaches that have been used are: (i) reduction to an alternative problem and (ii) the Galerkin method and passage to the limit through a sequence of finite dimensional spaces. However in both of these approaches a monotonicity assumption on f with respect to u (e.g., .f~ ~ ~, ~> 0) has always been resorted to, this assumption playing a crucial role in both of the above approaches. In [4] we considered the nonlinear wave equation
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تاریخ انتشار 2004