The Differential Equations (Paperback, Revised edition)

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Here in this highly useful reference is the finest overview of differential equations currently available, with hundreds of differential equations problems that cover everything from integrating factors and Bernoulli's equation to variation of parameters and undetermined coefficients. Each problem is clearly solved with step-by-step detailed solutions.
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TABLE OF CONTENTS
Introduction
Units Conversion Factors
Chapter 1: Classification of Differential Equations
Chapter 2: Separable Differential Equations
Variable Transformation u = ax + by
Variable Transformation y = vx
Chapter 3: Exact Differential Equations
Definitions and Examples
Solving Exact Differential Equations
Making a Non-exact Differential Equation Exact
Chapter 4: Homogenous Differential Equations
Identifying Homogenous Differential Equations
Solving Homogenous Differential Equations by Substitution and Separation
Chapter 5: Integrating Factors
General Theory of Integrating Factors
Equations of Form dy/dx + p(x)y = q(x)
Grouping to Simplify Solutions
Solution Directly From M(x, y)dx + N(x, y)dy = 0
Chapter 6: Method of Grouping
Chapter 7: Linear Differential Equations
Integrating Factors
Bernoulli's Equation
Chapter 8: Riccati's Equation
Chapter 9: Clairaut's Equation
Geometrical Construction Problems
Chapter 10: Orthogonal Trajectories
Elimination of Constants
Orthogonal Trajectories
Differential Equations Derived from Considerations of Analytical Geometry
Chapter 11: First Order Differential Equations: Applications I
Gravity and Projectile
Hooke's Law, Springs
Angular Motion
Over-hanging Chain
Chapter 12: First Order Differential Equations: Applications II
Absorption of Radiation
Population Dynamics
Radioactive Decay
Temperature
Flow from an Orifice
Mixing Solutions
Chemical Reactions
Economics
One-Dimensional Neutron Transport
Suspended Cable
Chapter 13: The Wronskian and Linear Independence
Determining Linear Independence of a Set of Functions
Using the Wronskian in Solving Differential Equations
Chapter 14: Second Order Homogenous Differential Equations with Constant Coefficients
Roots of Auxiliary Equations: Real
Roots of Auxiliary: Complex
Initial Value
Higher Order Differential Equations
Chapter 15: Method of Undetermined Coefficients
First Order Differential Equations
Second Order Differential Equations
Higher Order Differential Equations
Chapter 16: Variation of Parameters
Solution of Second Order Constant Coefficient Differential Equations
Solution of Higher Order Constant Coefficient Differential Equations
Solution of Variable Coefficient Differential Equations
Chapter 17: Reduction of Order
Chapter 18: Differential Operators
Algebra of Differential Operators
Properties of Differential Operators
Simple Solutions
Solutions Using Exponential Shift
Solutions by Inverse Method
Solution of a System of Differential Equations
Chapter 19: Change of Variables
Equation of Type (ax + by + c)dx + (dx + ey + f)dy = 0
Substitutions for Euler Type Differential Equations
Trigonometric Substitutions
Other Useful Substitutions
Chapter 20: Adjoint of a Differential Equation
Chapter 21: Applications of Second Order Differential Equations
Harmonic Oscillator
Simple Pendulum
Coupled Oscillator and Pendulum
Motion
Beam and Cantilever
Hanging Cable
Rotational Motion
Chemistry
Population Dynamics
Curve of Pursuit
Chapter 22: Electrical Circuits
Simple Circuits
RL Circuits
RC Circuits
LC Circuits
ComplexNetworks
Chapter 23: Power Series
Some Simple Power Series
Solutions May Be Expanded
Finding Power Series Solutions
Power Series Solutions for Initial Value Problems
Chapter 24: Power Series about an Ordinary Point
Initial Value Problems
Special Equations
Taylor Series Solution to Initial Value Problem
Chapter 25: Power Series about a Singular Point
Singular Points and Indicial Equations
Frobenius Method
Modified Frobenius Method
Indicial Roots: Equal
Special Equations
Chapter 26: Laplace Transforms
Exponential Order
Simple Functions
Combination of Simple Functions
Definite Integral
Step Functions
Periodic Functions
Chapter 27: Inverse Laplace Transforms
Partial Fractions
Completing the Square
Infinite Series
Convolution
Chapter 28: Solving Initial Value Problems by Laplace Transforms
Solutions of First Order Initial Value Problems
Solutions of Second Order Initial Value Problems
Solutions of Initial Value Problems Involving Step Functions
Solutions of Third Order Initial Value Problems
Solutions of Systems of Simultaneous Equations
Chapter 29: Second Order Boundary Value Problems
Eigenfunctions and Eigenvalues of Boundary Value Problem
Chapter 30: Sturm-Liouville Problems
Definitions
Some Simple Solutions
Properties of Sturm-Liouville Equations
Orthonormal Sets of Functions
Properties of the Eigenvalues
Properties of the Eigenfunctions
Eigenfunction Expansion of Functions
Chapter 31: Fourier Series
Properties of the Fourier Series
Fourier Series Expansions
Sine and Cosine Expansions
Chapter 32: Bessel and Gamma Functions
Properties of the Gamma Function
Solutions to Bessel's Equation
Chapter 33: Systems of Ordinary Differential Equations
Converting Systems of Ordinary Differential Equations
Solutions of Ordinary Differential Equation Systems
Matrix Mathematics
Finding Eigenvalues of a Matrix
Converting Systems of Ordinary Differential Equations into Matrix Form
Calculating the Exponential of a Matrix
Solving Systems by Matrix Methods
Chapter 34: Simultaneous Linear Differential Equations
Definitions
Solutions of 2 x 2 Systems
Checking Solution and Linear Independence in Matrix Form
Solution of 3 x 3 Homogenous System
Solution of Non-homogenous System
Chapter 35: Method of Perturbation
Chapter 36: Non-Linear Differential Equations
Reduction of Order
Dependent Variable Missing
Independent Variable Missing
Dependent and Independent Variable Missing
Factorization
Critical Points
Linear Systems
Non-Linear Systems
Liapunov Function Analysis
Second Order Equation
Perturbation Series
Chapter 37: Approximation Techniques
Graphical Methods
Successive Approximation
Euler's Method
Modified Euler's Method
Chapter 38: Partial Differential Equations
Solutions of General Partial Differential Equations
Heat Equation
Laplace's Equation
One-Dimensional Wave Equation
Chapter 39: Calculus of Variations
Index
WHAT THIS BOOK IS FOR
Students have generally found differential equations a difficult subject to understand and learn. Despite the publication of hundreds of textbooks in this field, each one intended to provide an improvement over previous textbooks, students of differential equations continue to remain perplexed as a result of numerous subject areas that must be remembered and correlated when solving problems. Various interpretations of differential equations terms also contribute to the difficulties of mastering the subject.
In a study of differential equations, REA found the following basic reasons underlying the inherent difficulties of differential equations:
No systematic rules of analysis were ever developed to follow in a step-by-step manner to solve typically encountered problems. This results from numerous different conditions and principles involved in a problem that leads to many possible different solution methods. To prescribe a set of rules for each of the possible variations would involve an enormous number of additional steps, making this task more burdensome than solving the problem directly due to the expectation of much trial and error.
Current textbooks normally explain a given principle in a few pages written by a differential equations professional who has insight into the subject matter not shared by others. These explanations are often written in an abstract manner that causes confusion as to the principle's use and application. Explanations then are often not sufficiently detailed or extensive enough to make the reader aware of the wide range of applications and different aspects of the principle being studied. The numerous possible variations of principles and their applications are