Abstract
We establish the existence of extreme solutions for a class of nonlinear second-order evolution inclusions with a nonconvex right-hand side defined on an evolution triple of Banach spaces. Then we show that extreme solutions which belong to the solution set of the original system are in fact dense and codense in the solution set of a system with a convexified right-hand side. The necessary and sufficient conditions for closedness of the solution set for the original system in an appropriate spaces of functions are given as well. Finally, an example of a nonlinear hyperbolic distributed parameter system is worked out in detail.
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Tolstonogov, A.A. Properties of the Set of Extreme Solutions for a Class of Nonlinear Second-Order Evolution Inclusions. Set-Valued Analysis 10, 53–77 (2002). https://doi.org/10.1023/A:1014494827922
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DOI: https://doi.org/10.1023/A:1014494827922