Title
Inverse Problems and Nonlinear Evolution Equations: Solutions, Darboux Matrices and WeylTitchmarsh Functions (De Gruyter Studie,Used
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This book is based on the method of operator identities and related theory of Snodes, both developed by Lev Sakhnovich. The notion of the transfer matrix function generated by the Snode plays an essential role. The authors present fundamental solutions of various important systems of differential equations using the transfer matrix function, that is, either directly in the form of the transfer matrix function or via the representation in this form of the corresponding Darboux matrix, when BcklundDarboux transformations and explicit solutions are considered. The transfer matrix function representation of the fundamental solution yields solution of an inverse problem, namely, the problem to recover system from its Weyl function. Weyl theories of selfadjoint and skewselfadjoint Dirac systems, related canonical systems, discrete Dirac systems, system auxiliary to the Nwave equation and a system rationally depending on the spectral parameter are obtained in this way. The results on direct and inverse problems are applied in turn to the study of the initialboundary value problems for integrable (nonlinear) wave equations via inverse spectral transformation method. Evolution of the Weyl function and solution of the initialboundary value problem in a semistrip are derived for many important nonlinear equations. Some uniqueness and global existence results are also proved in detail using evolution formulas. The reading of the book requires only some basic knowledge of linear algebra, calculus and operator theory from the standard university courses.
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