Peter I. Kogut & Olga P. Kupenko 
Approximation Methods in Optimization of Nonlinear Systems [PDF ebook] 

The monograph addresses some problems particularly with regard to ill-posedness of boundary value problems and problems where we cannot expect to have uniqueness of their solutions in the standard functional spaces. Bringing original and previous results together, it tackles computational challenges by exploiting methods of approximation and asymptotic analysis and harnessing differences between optimal control problems and their underlying PDEs

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