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Each Problem Solver is an insightful and essential study and solution guide chock-full of clear, concise problem-solving gems. All your questions can be found in one convenient source from one of the most trusted names in reference solution guides. M Each Problem Solver is an insightful and essential study and solution guide chock-full of clear, concise problem-solving gems. All your questions can be found in one convenient source from one of the most trusted names in reference solution guides. More useful, more practical, and more informative, these study aids are the best review books and textbook companions available. Nothing remotely as comprehensive or as helpful exists in their subject anywhere. Perfect for undergraduate and graduate studies.

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.

**DETAILS**

- The PROBLEM SOLVERS are unique - the ultimate in study guides.

- They are ideal for helping students cope with the toughest subjects.

- They greatly simplify study and learning tasks.

- They enable students to come to grips with difficult problems by showing them the way, step-by-step, toward solving problems. As a result, they save hours of frustration and time spent on groping for answers and understanding.

- They cover material ranging from the elementary to the advanced in each subject.

- They work exceptionally well with any text in its field.

- PROBLEM SOLVERS are available in 41 subjects.

- Each PROBLEM SOLVER is prepared by supremely knowledgeable experts.

- Most are over 1000 pages.

- PROBLEM SOLVERS are not meant to be read cover to cover. They offer whatever may be needed at a given time. An excellent index helps to locate specific problems rapidly.

**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

Complex Networks

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 aspect... ...Continua

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.

- The PROBLEM SOLVERS are unique - the ultimate in study guides.

- They are ideal for helping students cope with the toughest subjects.

- They greatly simplify study and learning tasks.

- They enable students to come to grips with difficult problems by showing them the way, step-by-step, toward solving problems. As a result, they save hours of frustration and time spent on groping for answers and understanding.

- They cover material ranging from the elementary to the advanced in each subject.

- They work exceptionally well with any text in its field.

- PROBLEM SOLVERS are available in 41 subjects.

- Each PROBLEM SOLVER is prepared by supremely knowledgeable experts.

- Most are over 1000 pages.

- PROBLEM SOLVERS are not meant to be read cover to cover. They offer whatever may be needed at a given time. An excellent index helps to locate specific problems rapidly.

Introduction

Units Conversion Factors

Variable Transformation u = ax + by

Variable Transformation y = vx

Definitions and Examples

Solving Exact Differential Equations

Making a Non-exact Differential Equation Exact

Identifying Homogenous Differential Equations

Solving Homogenous Differential Equations by Substitution and Separation

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

Integrating Factors

Bernoulli's Equation

Geometrical Construction Problems

Elimination of Constants

Orthogonal Trajectories

Differential Equations Derived from Considerations of Analytical Geometry

Gravity and Projectile

Hooke's Law, Springs

Angular Motion

Over-hanging Chain

Absorption of Radiation

Population Dynamics

Radioactive Decay

Temperature

Flow from an Orifice

Mixing Solutions

Chemical Reactions

Economics

One-Dimensional Neutron Transport

Suspended Cable

Determining Linear Independence of a Set of Functions

Using the Wronskian in Solving Differential Equations

Roots of Auxiliary Equations: Real

Roots of Auxiliary: Complex

Initial Value

Higher Order Differential Equations

First Order Differential Equations

Second Order Differential Equations

Higher Order Differential Equations

Solution of Second Order Constant Coefficient Differential Equations

Solution of Higher Order Constant Coefficient Differential Equations

Solution of Variable Coefficient Differential Equations

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

Equation of Type (ax + by + c)dx + (dx + ey + f)dy = 0

Substitutions for Euler Type Differential Equations

Trigonometric Substitutions

Other Useful Substitutions

Harmonic Oscillator

Simple Pendulum

Coupled Oscillator and Pendulum

Motion

Beam and Cantilever

Hanging Cable

Rotational Motion

Chemistry

Population Dynamics

Curve of Pursuit

Simple Circuits

RL Circuits

RC Circuits

LC Circuits

Complex Networks

Chapter 23: Power Series

Some Simple Power Series

Solutions May Be Expanded

Finding Power Series Solutions

Power Series Solutions for Initial Value Problems

Initial Value Problems

Special Equations

Taylor Series Solution to Initial Value Problem

Singular Points and Indicial Equations

Frobenius Method

Modified Frobenius Method

Indicial Roots: Equal

Special Equations

Exponential Order

Simple Functions

Combination of Simple Functions

Definite Integral

Step Functions

Periodic Functions

Partial Fractions

Completing the Square

Infinite Series

Convolution

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

Eigenfunctions and Eigenvalues of Boundary Value Problem

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

Properties of the Fourier Series

Fourier Series Expansions

Sine and Cosine Expansions

Properties of the Gamma Function

Solutions to Bessel's Equation

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

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

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

Graphical Methods

Successive Approximation

Euler's Method

Modified Euler's Method

Solutions of General Partial Differential Equations

Heat Equation

Laplace's Equation

One-Dimensional Wave Equation

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 aspect... ...Continua

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