LINEAR AND NONLINEAR PROGRAMMING
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1 LINEAR AND NONLINEAR PROGRAMMING Stephen G. Nash and Ariela Sofer George Mason University The McGraw-Hill Companies, Inc. New York St. Louis San Francisco Auckland Bogota Caracas Lisbon London Madrid Mexico City Milan Montreal New Delhi San Juan Singapore Sydney Tokyo Toronto
2 Contents Preface Acknowledgments xv xxv Part I Basics Optimization Models 1.1 Introduction 1.2 Linear Equations 1.3 Linear Programming 1.4 Least Squares Data Fitting 1.5 Nonlinear Programming Fundamentals of Optimization 2.1 Introduction 2.2 Feasibility and Optimality 2.3 Convexity Derivatives and Convexity 2.4 The General Optimization Algorithm 2.5 Rates of Convergence 2.6 Taylor Series 2.7 Newton's Method for Nonlinear Equations Systems of Nonlinear Equations Representation of Linear Constraints 3.1 Basic Concepts 3.2 Null and Range Spaces 3.3 Generating Null-Space Matrices Variable Reduction Method Orthogonal Projection Matrix ix
3 CONTENTS Other Projections The QR Factorization 61 Part II Linear Programming 4 Geometry of Linear Programming Introduction Standard Form Basic Solutions and Extreme Points Representation of Solutions; Optimality 86 5 The Simplex Method Introduction The Simplex Method General Formulas Unbounded Problems The Simplex Method (Tableaus) The Füll Tableau Deficiencies of the Füll Tableau The Revised Simplex Tableau The Revised Tableau Versus the Füll Tableau The Simplex Method (Details) Multiple Solutions Feasible Directions and Edge Directions Getting Started Artificial Variables The Two-Phase Method The Big-M Method Degeneracy and Termination Resolving Degeneracy Using Perturbation Duality and Sensitivity The Dual Problem Duality Theory Complementary Slackness Interpretation of the Dual The Dual Simplex Method Sensitivity Parametric Linear Programming Enhancements of the Simplex Method Introduction The Simplex Method Using the Product Form of the Inverse Problems with Upper Bounds Column Generation The Decomposition Principle Numerical Stability and Computational Efficiency Representation of the Basis Pricing The Initial Basis 227
4 XI Tolerances; Degeneracy Scaling Preprocessing Model Formats Network Problems Introduction Basic Concepts and Examples Representation of the Basis The Network Simplex Method Resolving Degeneracy Computational Complexity of Linear Programming Introduction Computational Complexity Worst-Case Behavior of the Simplex Method The Ellipsoid Method The Average Case Behavior of the Simplex Method The Primal-Dual Interior-Point Method 280 Part III Unconstrained Optimization 10 Basics of Unconstrained Optimization Introduction Optimality Conditions Newton's Method for Minimization Guaranteeing Descent Guaranteeing Convergence: Line-Search Methods Other Line Searches Guaranteeing Convergence: Trust-Region Methods Methods for Unconstrained Optimization Introduction Steepest Descent Quasi-Newton Methods Automating and Avoiding Derivative Calculations Finite Difference Derivative Estimates Automatic Differentiation Methods That Do Not Require Derivatives Termination Rules Historical Background Low-Storage Methods For Unconstrained Problems Introduction Iterative Methods for Solving Linear Equations Truncated-Newton Methods Nonlinear Conjugate-Gradient Methods Limited-Memory Quasi-Newton Methods Preconditioning 404
5 Xll CONTENTS 13 Nonlinear Least-Squares Data Fitting Introduction Nonlinear Least-Squares Data Fitting Statistical Tests Orthogonal Distance Regression 420 Part IV Nonlinear Programming 14 Optimality Conditions for Constrained Problems Introduction Optimality Conditions for Linear Equality Constraints The Lagrange Multipliers and the Lagrangian Function Optimality Conditions for Linear Inequality Constraints Optimality Conditions for Nonlinear Constraints Statement of Optimality Conditions Preview of Methods Derivation of Optimality Conditions For Nonlinear Constraints Duality Games and Min-Max Duality Lagrangian Duality More on the Dual Function Historical Background Feasible-Point Methods Introduction Linear Equality Constraints Computing the Lagrange Multipliers Linear Inequality Constraints Linear Programming Sequential Quadratic Programming Reduced-Gradient Methods Penalty and Barrier Methods Introduction Classical Penalty and Barrier Methods Barrier Methods Penalty Methods Convergence Conditioning Stabilized Penalty and Barrier Methods Exact Penalty Methods Multiplier-Based Methods Dual Interpretation Interior-Point Methods for Linear and Convex Programming Introduction Interior-Point Methods for Linear Programming Affine Scaling Methods 569
6 Xlll 17.4 Path-Following Methods Karmarkar's Projective Scaling Method Interior-Point Methods for Convex Programming Basic Ideas of Seif Concordance The Newton Decrement Convergence of the Damped Newton Method The Path-Following Method Convergence and Complexity 606 Appendices A Topics from Linear Algebra 617 A.l Introduction 617 A.2 Vector and Matrix Norms 617 A.3 Systems of Linear Equations 619 A.4 Solving Systems of Linear Equations by Elimination 621 A.5 Gaussian Elimination as a Matrix Factorization 624 A.5.1 Sparse Matrix Storage 631 A.6 Other Matrix Factorizations 632 A.6.1 Positive-Definite Matrices 632 A.6.2 The LDL T and Cholesky Factorizations 634 A.6.3 An Orthogonal Matrix Factorization 636 A.7 Sensitivity (Conditioning) 638 A.7.1 Eigenvalues and Sensitivity 642 A.8 The Sherman-Morrison Formula 643 B Other Fundamentals 646 B.l Introduction 646 B.2 Computer Arithmetic 646 B.3 Big-0 Notation, O(-) 648 B.4 The Gradient, Hessian, and Jacobian 649 B.5 Gradient and Hessian of a Quadratic Function 651 B.6 Derivatives of a Product 652 B.7 The Chain Rule 653 B.8 Continuous Functions; Closed and Bounded Sets 654 B.9 The Implicit Function Theorem 655 C Software 658 C.l Software 658 D Bibliography 661 Index 679
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