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This book represents an elementary introduction into applied functional analysis addressed to beginning graduate students in mathematics, physics and engineering. The book may also be utilized as a reference book. This work consists of two volumes
This book represents an elementary introduction into applied functional analysis addressed to beginning graduate students in mathematics, physics and engineering. The book may also be utilized as a reference book. This work consists of two volumes
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Inhaltsangabe
1 Banach Spaces and Fixed-Point Theorems.- 1.1 Linear Spaces and Dimension.- 1.2 Normed Spaces and Convergence.- 1.3 Banach Spaces and the Cauchy Convergence Criterion.- 1.4 Open and Closed Sets.- 1.5 Operators.- 1.6 The Banach Fixed-Point Theorem and the Iteration Method.- 1.7 Applications to Integral Equations.- 1.8 Applications to Ordinary Differential Equations.- 1.9 Continuity.- 1.10 Convexity.- 1.11 Compactness.- 1.12 Finite-Dimensional Banach Spaces and Equivalent Norms.- 1.13 The Minkowski Functional and Homeomorphisms.- 1.14 The Brouwer Fixed-Point Theorem.- 1.15 The Schauder Fixed-Point Theorem.- 1.16 Applications to Integral Equations.- 1.17 Applications to Ordinary Differential Equations.- 1.18 The Leray-Schauder Principle and a priori Estimates.- 1.19 Sub- and Supersolutions, and the Iteration Method in Ordered Banach Spaces.- 1.20 Linear Operators.- 1.21 The Dual Space.- 1.22 Infinite Series in Normed Spaces.- 1.23 Banach Algebras and Operator Functions.- 1.24 Applications to Linear Differential Equations in Banach Spaces.- 1.25 Applications to the Spectrum.- 1.26 Density and Approximation.- 1.27 Summary of Important Notions.- 2 Hilbert Spaces, Orthogonality, and the Dirichlet Principle.- 2.1 Hilbert Spaces.- 2.2 Standard Examples.- 2.3 Bilinear Forms.- 2.4 The Main Theorem on Quadratic Variational Problems.- 2.5 The Functional Analytic Justification of the Dirichlet Principle.- 2.6 The Convergence of the Ritz Method for Quadratic Variational Problems.- 2.7 Applications to Boundary-Value Problems, the Method of Finite Elements, and Elasticity.- 2.8 Generalized Functions and Linear Functionals.- 2.9 Orthogonal Projection.- 2.10 Linear Functionals and the Riesz Theorem.- 2.11 The Duality Map.- 2.12 Duality for Quadratic Variational Problems.- 2.13 The Linear Orthogonality Principle.- 2.14 Nonlinear Monotone Operators.- 2.15 Applications to the Nonlinear Lax-Milgram Theorem and the Nonlinear Orthogonality Principle.- 3 Hilbert Spaces and Generalized Fourier Series.- 3.1 Orthonormal Series.- 3.2 Applications to Classical Fourier Series.- 3.3 The Schmidt Orthogonalization Method.- 3.4 Applications to Polynomials.- 3.5 Unitary Operators.- 3.6 The Extension Principle.- 3.7 Applications to the Fourier Transformation.- 3.8 The Fourier Transform of Tempered Generalized Functions.- 4 Eigenvalue Problems for Linear Compact Symmetric Operators.- 4.1 Symmetric Operators.- 4.2 The Hilbert-Schmidt Theory.- 4.3 The Fredholm Alternative.- 4.4 Applications to Integral Equations.- 4.5 Applications to Boundary-Eigenvalue Value Problems.- 5 Self-Adjoint Operators, the Friedrichs Extension and the Partial Differential Equations of Mathematical Physics.- 5.1 Extensions and Embeddings.- 5.2 Self-Adjoint Operators.- 5.3 The Energetic Space.- 5.4 The Energetic Extension.- 5.5 The Friedrichs Extension of Symmetric Operators.- 5.6 Applications to Boundary-Eigenvalue Problems for the Laplace Equation.- 5.7 The Poincaré Inequality and Rellich's Compactness Theorem.- 5.8 Functions of Self-Adjoint Operators.- 5.9 Semigroups, One-Parameter Groups, and Their Physical Relevance.- 5.10 Applications to the Heat Equation.- 5.11 Applications to the Wave Equation.- 5.12 Applications to the Vibrating String and the Fourier Method.- 5.13 Applications to the Schrödinger Equation.- 5.14 Applications to Quantum Mechanics.- 5.15 Generalized Eigenfunctions.- 5.16 Trace Class Operators.- 5.17 Applications to Quantum Statistics.- 5.18 C*-Algebras and the Algebraic Approach to Quantum Statistics.- 5.19 The Fock Space in Quantum Field Theory and the Pauli Principle.- 5.20 A Look at Scattering Theory.- 5.21 The Language of Physicists in Quantum Physics and the Justification of the Dirac Calculus.- 5.22 The Euclidean Strategy in Quantum Physics.- 5.23 Applications to Feynman's Path Integral.- 5.24 The Importance of the Propagator in Quantum Physics.- 5.25 A Look at Solitons and Inverse Scattering Theory.- Epilogue.- References.- Hints for Further Reading.- List of Symbols.- List of Theorems.- List of the Most Important Definitions.
1 Banach Spaces and Fixed-Point Theorems.- 1.1 Linear Spaces and Dimension.- 1.2 Normed Spaces and Convergence.- 1.3 Banach Spaces and the Cauchy Convergence Criterion.- 1.4 Open and Closed Sets.- 1.5 Operators.- 1.6 The Banach Fixed-Point Theorem and the Iteration Method.- 1.7 Applications to Integral Equations.- 1.8 Applications to Ordinary Differential Equations.- 1.9 Continuity.- 1.10 Convexity.- 1.11 Compactness.- 1.12 Finite-Dimensional Banach Spaces and Equivalent Norms.- 1.13 The Minkowski Functional and Homeomorphisms.- 1.14 The Brouwer Fixed-Point Theorem.- 1.15 The Schauder Fixed-Point Theorem.- 1.16 Applications to Integral Equations.- 1.17 Applications to Ordinary Differential Equations.- 1.18 The Leray-Schauder Principle and a priori Estimates.- 1.19 Sub- and Supersolutions, and the Iteration Method in Ordered Banach Spaces.- 1.20 Linear Operators.- 1.21 The Dual Space.- 1.22 Infinite Series in Normed Spaces.- 1.23 Banach Algebras and Operator Functions.- 1.24 Applications to Linear Differential Equations in Banach Spaces.- 1.25 Applications to the Spectrum.- 1.26 Density and Approximation.- 1.27 Summary of Important Notions.- 2 Hilbert Spaces, Orthogonality, and the Dirichlet Principle.- 2.1 Hilbert Spaces.- 2.2 Standard Examples.- 2.3 Bilinear Forms.- 2.4 The Main Theorem on Quadratic Variational Problems.- 2.5 The Functional Analytic Justification of the Dirichlet Principle.- 2.6 The Convergence of the Ritz Method for Quadratic Variational Problems.- 2.7 Applications to Boundary-Value Problems, the Method of Finite Elements, and Elasticity.- 2.8 Generalized Functions and Linear Functionals.- 2.9 Orthogonal Projection.- 2.10 Linear Functionals and the Riesz Theorem.- 2.11 The Duality Map.- 2.12 Duality for Quadratic Variational Problems.- 2.13 The Linear Orthogonality Principle.- 2.14 Nonlinear Monotone Operators.- 2.15 Applications to the Nonlinear Lax-Milgram Theorem and the Nonlinear Orthogonality Principle.- 3 Hilbert Spaces and Generalized Fourier Series.- 3.1 Orthonormal Series.- 3.2 Applications to Classical Fourier Series.- 3.3 The Schmidt Orthogonalization Method.- 3.4 Applications to Polynomials.- 3.5 Unitary Operators.- 3.6 The Extension Principle.- 3.7 Applications to the Fourier Transformation.- 3.8 The Fourier Transform of Tempered Generalized Functions.- 4 Eigenvalue Problems for Linear Compact Symmetric Operators.- 4.1 Symmetric Operators.- 4.2 The Hilbert-Schmidt Theory.- 4.3 The Fredholm Alternative.- 4.4 Applications to Integral Equations.- 4.5 Applications to Boundary-Eigenvalue Value Problems.- 5 Self-Adjoint Operators, the Friedrichs Extension and the Partial Differential Equations of Mathematical Physics.- 5.1 Extensions and Embeddings.- 5.2 Self-Adjoint Operators.- 5.3 The Energetic Space.- 5.4 The Energetic Extension.- 5.5 The Friedrichs Extension of Symmetric Operators.- 5.6 Applications to Boundary-Eigenvalue Problems for the Laplace Equation.- 5.7 The Poincaré Inequality and Rellich's Compactness Theorem.- 5.8 Functions of Self-Adjoint Operators.- 5.9 Semigroups, One-Parameter Groups, and Their Physical Relevance.- 5.10 Applications to the Heat Equation.- 5.11 Applications to the Wave Equation.- 5.12 Applications to the Vibrating String and the Fourier Method.- 5.13 Applications to the Schrödinger Equation.- 5.14 Applications to Quantum Mechanics.- 5.15 Generalized Eigenfunctions.- 5.16 Trace Class Operators.- 5.17 Applications to Quantum Statistics.- 5.18 C*-Algebras and the Algebraic Approach to Quantum Statistics.- 5.19 The Fock Space in Quantum Field Theory and the Pauli Principle.- 5.20 A Look at Scattering Theory.- 5.21 The Language of Physicists in Quantum Physics and the Justification of the Dirac Calculus.- 5.22 The Euclidean Strategy in Quantum Physics.- 5.23 Applications to Feynman's Path Integral.- 5.24 The Importance of the Propagator in Quantum Physics.- 5.25 A Look at Solitons and Inverse Scattering Theory.- Epilogue.- References.- Hints for Further Reading.- List of Symbols.- List of Theorems.- List of the Most Important Definitions.
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