Superb, self-contained graduate-level text covers standard theorems concerning linear systems, existence and uniqueness of solutions, and dependence on parameters. Major focus on stability theory and its applications to oscillation phenomena, self-excited oscillations and regulator problem of Lurie. Bibliography. Exercises.

Table of Contents for The Qualitative Theory of Ordinary Differential Equations: An Introduction

Preface
Chapter 1. Systems of Differential Equations
1.1 A Simple Mass-Spring System
1.2 Coupled Mass-Spring Systems
1.3 Systems of First-Order Equations
1.4 Vector-Matrix Notation for Systems
1.5 The Need for a Theory
1.6 Existence, Uniqueness, and Continuity
1.7 The Gronwall Inequality
Chapter 2. Linear Systems, with an Introduction to Phase Space Analysis
2.1 Introduction
2.2 Existence and Uniqueness for Linear Systems
2.3 Linear Homogeneous Systems
2.4 Linear Nonhomogeneous Systems
2.5 Linear Systems with Constant Coefficients
2.6 Similarity of Matrices and the Jordan Canonical Form
2.7 Asymptotic Behavior of Solutions of Linear Systems with Constant Coefficients
2.8 Autonomous Systems--Phase Space--Two-Dimensional Systems
2.9 Linear Systems with Periodic Coefficients; Miscellaneous Exercises
Chapter 3. Existence Theory
3.1 Existence in the Scalar Case
3.2 Existence Theory for Systems of First-Order Equations
3.3 Uniqueness of Solutions
3.4 Continuation of Solutions
3.5 Dependence on Initial Conditions and Parameters; Miscellaneous Exercises
Chapter 4. Stability of Linear and Almost Linear Systems
4.1 Introduction
4.2 Definitions of Stability
4.3 Linear Systems
4.4 Almost Linear Systems
4.5 Conditional Stability
4.6 Asymptotic Equivalence
4.7 Stability of Periodic Solutions
Chapter 5. Lyapunov's Second Method
5.1 Introductory Remarks
5.2 Lyapunov's Theorems
5.3 Proofs of Lyapunov's Theorems
5.4 Invariant Sets and Stability
5.5 The Extent of Asymptotic Stability--Global Asymptotic Stability
5.6 Nonautonomous Systems
Chapter 6. Some Applications
6.1 Introduction
6.2 The Undamped Oscillator
6.3 The Pendulum
6.4 Self-Excited Oscillations--Periodic Solutions of the Liénard Equation
6.5 The Regulator Problem
6.6 Absolute Stability of the Regulator System
Appendix 1. Generalized Eigenvectors, Invariant Subspaces, and Canonical Forms of Matrices
Appendix 2. Canonical Forms of 2 x 2 Matrices
Appendix 3. The Logarithm of a Matrix
Appendix 4. Some Results from Matrix Theory
Bibliography; Index

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