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AuthorDeimling, Klaus. author
TitleNonlinear Functional Analysis [electronic resource] / by Klaus Deimling
ImprintBerlin, Heidelberg : Springer Berlin Heidelberg : Imprint: Springer, 1985
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Descript XIV, 450 p. 30 illus. online resource


topics. However, only a modest preliminary knowledge is needed. In the first chapter, where we introduce an important topological concept, the so-called topological degree for continuous maps from subsets ofRn into Rn, you need not know anything about functional analysis. Starting with Chapter 2, where infinite dimensions first appear, one should be familiar with the essential step of considerยญ ing a sequence or a function of some sort as a point in the corresponding vector space of all such sequences or functions, whenever this abstraction is worthwhile. One should also work out the things which are proved in ยง 7 and accept certain basic principles of linear functional analysis quoted there for easier references, until they are applied in later chapters. In other words, even the 'completely linear' sections which we have included for your convenience serve only as a vehicle for progress in nonlinearity. Another point that makes the text introductory is the use of an essentially uniform mathematical language and way of thinking, one which is no doubt familiar from elementary lectures in analysis that did not worry much about its connections with algebra and topology. Of course we shall use some elementary topological concepts, which may be new, but in fact only a few remarks here and there pertain to algebraic or differential topological concepts and methods


1. Topological Degree in Finite Dimensions -- ยง 1. Uniqueness of the Degree -- ยง 2. Construction of the Degree -- ยง 3. Further Properties of the Degree -- ยง 4. Borsukโ{128}{153}s Theorem -- ยง 5. The Product Formula -- ยง 6. Concluding Remarks -- 2. Topological Degree in Infinite Dimensions -- ยง 7. Basic Facts About Banach Spaces -- ยง 8. Compact Maps -- ยง 9. Set Contractions -- ยง 10. Concluding Remarks -- 3. Monotone and Accretive Operators -- ยง 11. Monotone Operators on Hilbert Spaces -- ยง 12. Monotone Operators on Banach Spaces -- ยง 13. Accretive Operators -- ยง 14. Concluding Remarks -- Exercises -- 4. Implicit Functions and Problems at Resonance -- ยง 15. Implicit Functions -- ยง 16. Problems at Resonance -- 5. Fixed Point Theory -- ยง 17. Metric Fixed Point Theory -- ยง 18. Fixed Point Theorems Involving Compactness -- 6. Solutions in Cones -- ยง 19. Cones and Increasing Maps -- ยง 20. Solutions in Cones -- 7. Approximate Solutions -- ยง 21. Approximation Solvability -- ยง 22. A-Proper Maps and Galerkin for Differential Equations -- 8. Multis -- ยง 23. Monotone and Accretive Multis -- ยง 24. Multis and Compactness -- 9. Extremal Problems -- ยง 25. Convex Analysis -- ยง 26. Extrema Under Constraints -- ยง 27. Critical Points of Functionals -- 10. Bifurcation -- ยง 28. Local Bifurcation -- ยง 29. Global Bifurcation -- ยง 30. Further Topics in Bifurcation Theory -- Epilogue -- Symbols

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