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This reference/text develops a constructive theory of solvability on linear and nonlinear abstract and differential equations involving Aproper operator equations in separable Banach spaces, and treats the problem of existence of a solution for equations involving pseudoAproper and weaklyAproper mappings, and illustrates their applications.;Facilitating the understanding of the solvability of equations in infinite dimensional Banach space through finite dimensional appoximations, this book: offers an elementary introductions to the general theory of Aproper and pseudoAproper maps; develops the linear theory of Aproper maps; furnishes the best possible results for linear equations; establishes the existence of fixed points and eigenvalues for Pgammacompact maps, including classical results; provides surjectivity theorems for pseudoAproper and weaklyAproper mappings that unify and extend earlier results on monotone and accretive mappings; shows how Friedrichs' linear extension theory can be generalized to the extensions of densely defined nonlinear operators in a Hilbert space; presents the generalized topological degree theory for Aproper mappings; and applies abstract results to boundary value problems and to bifurcation and asymptotic bifurcation problems.;There are also over 900 display equations, and an appendix that contains basic theorems from real function theory and measure/integration theory.
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