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Zbl 1083.47003
Boichuk, A. A.; Samoilenko, A. M.
(Bojchuk, A. A.; Samojlenko, A. M.)
Generalized inverse operators and Fredholm boundary-value problems. Translated from the Russian by P. V. Malyshev and D. V. Malyshev. (English)
[B] Utrecht: VSP. xiv, 317~p. EUR~170.00; \$~243.00 (2004). ISBN 90-6764-407-2/hbk

This monograph is devoted to generalized inverse operators and Fredholm boundary value problems. For this type of boundary value problems, the authors give a natural classification of critical and noncritical cases, establish sufficient conditions for the coefficients guaranteeing the existence of solutions, and develop iterative algorithms for the construction of solutions of these problems. The book is divided into 7 chapters. In Chapter 1 (Preliminary Information), some well-known definitions and results from functional analysis, the theory of linear operators in Hilbert and Banach spaces and matrix theory which are required for subsequent chapters are presented. In Chapter 2 (Generalized Inverse Operators in Banach Spaces), the authors study the problems encountered in the construction of generalized inverse operators for linear bounded Fredholm operators acting in Banach spaces. This construction is realized by complementing an original operator $L$ to an operator $\overline L$ of complete rank. In Chapter 3 (Psevdoinverse Operators in Hilbert Spaces), methods for the construction of generalized inverse operators in Hilbert spaces are studied. In Chapter 4 (Boundary-Value Problems for Operator Equations), the theory of generalized inversion and pseudoinversion of linear Fredholm operators in Banach and Hilbert spaces developed in the previous chapters enable the authors to develop a unified procedure for the investigation of Fredholm boundary-value problems for operator equations solvable either everywhere or not everywhere. The proposed approach is then improved for the analysis of boundary-value problems for standard operator systems, including systems of ordinary differential equations and equations with delay in Chapter 5 (Boundary Value Problems for Ordinary Differential Equations) and systems with impulsive action in Chapter 6 (Impulsive Boundary Value Problems for Systems of Ordinary Differential Equations). Finally, in Chapter 7 (Solutions of Differential and Difference Systems Bounded on the Entire Real Axis), the authors obtain necessary and sufficient conditions for the existence of solutions of linear and nonlinear differential and difference systems bounded on the entire axis. The bibliography contains 158 entries.
[Sotiris K. Ntouyas (Ioannina)]

MSC 2000:: *47A05 General theory of linear operators
47-02 Research monographs (operator theory)
34-02 Research monographs (ordinary differential equations)
34B15 Nonlinear boundary value problems of ODE
34B37 Boundary value problems with impulses
34K10 Boundary value problems for functional-differential equations
47A50 Equations and inequalities involving linear operators
47A53 (Semi-)Fredholm operators; index theories
47N20 Appl. of operator theory to differential and integral equations

Keywords: boundary value problems; topological degree; upper and lower functions; impulsive problem; periodic solution; differential equation

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