Elementary Differential Equations with Boundary Value Problems (Kohler/Johnson)

Elementary Differential Equations with Boundary Value Problems integrates the underlying theory, the solution procedures, and the numerical/computational aspects of differential equations in a seamless way that provides students with the necessary framework to understand and solve differential equations. Theory is presented as simply as possible with an emphasis on how to use it. With an emphasis on linear equations, linear and nonlinear equations (first order and higher order) are treated in separate chapters. In developing mathematical models, this text guides the student carefully through the underlying physical principles leading to the relevant mathematics. Asking students to use common sense, intuition, and ‘back-of-the-envelope’ checks as well as challenging them to anticipate and interpret the physical content of the solution encourage critical thinking. MARKET : Intended for use in introductory course in differential equations that includes boundary value problems. Cover......Page 1 Title Page......Page 2 Copyright Page......Page 3 Acknowledgments......Page 14 Contents......Page 6 Preface......Page 12 1.2 Examples of Di.erential Equations......Page 18 1.3 Direction Fields......Page 25 2.1 Introduction......Page 32 2.2 First Order Linear Di.erential Equations......Page 36 2.3 Introduction to Mathematical Models......Page 48 2.4 Population Dynamics and Radioactive Decay......Page 58 2.5 First Order Nonlinear Di.erential Equations......Page 65 2.6 Separable First Order Equations......Page 71 2.7 Exact Differential Equations......Page 80 2.8 The Logistic Population Model......Page 87 2.9 Applications to Mechanics......Page 94 2.10 Euler’s Method......Page 106 Review Exercises......Page 117 Projects......Page 118 Chapter 3 Second and Higher Order Linear Differential Equations......Page 124 3.1 Introduction......Page 125 3.2 The General Solution of Homogeneous Equations......Page 132 3.3 Constant Coe.cient Homogeneous Equations......Page 138 3.4 Real Repeated Roots; Reduction of Order......Page 144 3.5 Complex Roots......Page 149 3.6 Unforced Mechanical Vibrations......Page 159 3.7 The General Solution of a Linear Nonhomogeneous Equation......Page 171 3.8 The Method of Undetermined Coe.cients......Page 175 3.9 The Method of Variation of Parameters......Page 185 3.10 Forced Mechanical Vibrations, Electrical Networks, and Resonance......Page 191 3.11 Higher Order Linear Homogeneous Di.erential Equations......Page 205 3.12 Higher Order Homogeneous Constant Coe.cient Di.erential Equations......Page 212 3.13 Higher Order Linear Nonhomogeneous Di.erential Equations......Page 218 Projects......Page 223 4.1 Introduction......Page 230 4.2 Existence and Uniqueness......Page 240 4.3 Homogeneous Linear Systems......Page 245 4.4 Constant Coe.cient Homogeneous Systems; the Eigenvalue Problem......Page 255 4.5 Real Eigenvalues and the Phase Plane......Page 264 4.6 Complex Eigenvalues......Page 273 4.7 Repeated Eigenvalues......Page 283 4.8 Nonhomogeneous Linear Systems......Page 294 4.9 Numerical Methods for Systems of Linear Di.erential Equations......Page 305 4.10 The Exponential Matrix and Diagonalization......Page 317 Review Exercises......Page 327 Projects......Page 328 5.1 Introduction......Page 334 5.2 Laplace Transform Pairs......Page 346 5.3 The Method of Partial Fractions......Page 361 5.4 Laplace Transforms of Periodic Functions and System Transfer Functions......Page 367 5.5 Solving Systems of Di.erential Equations......Page 376 5.6 Convolution......Page 385 5.7 The Delta Function and Impulse Response......Page 394 Projects......Page 402 6.1 Introduction......Page 408 6.2 Equilibrium Solutions and Direction Fields......Page 417 6.3 Conservative Systems......Page 430 6.4 Stability......Page 441 6.5 Linearization and the Local Picture......Page 450 6.6 Two-Dimensional Linear Systems......Page 465 6.7 Predator-Prey Population Models......Page 475 Projects......Page 483 7.1 Introduction......Page 488 7.2 Euler’s Method, Heun’s Method, and the Modi.ed Euler’s Method......Page 490 7.3 Taylor Series Methods......Page 496 7.4 Runge-Kutta Methods......Page 510 Appendix 1: Convergence of One-Step Methods......Page 523 Appendix 2: Stability of One-Step Methods......Page 524 Projects......Page 527 8.1 Introduction......Page 532 8.2 Series Solutions Near an Ordinary Point......Page 544 8.3 The Euler Equation......Page 553 8.4 Solutions Near a Regular Singular Point and the Method of Frobenius......Page 559 8.5 The Method of Frobenius Continued: Special Cases and a Summary......Page 567 Projects......Page 578 9.1 Introduction......Page 582 9.2 Heat Flow in a Thin Bar; Separation of Variables......Page 587 9.3 Series Solutions......Page 597 9.4 Calculating the Solution......Page 606 9.5 Fourier Series......Page 617 9.6 The Wave Equation......Page 633 9.7 Laplace’s Equation......Page 645 9.8 Higher-Dimensional Problems; Nonhomogeneous Equations......Page 658 Project......Page 672 10.1 Introduction......Page 676 10.2 The Cauchy Problem......Page 679 10.3 Existence and Uniqueness......Page 685 10.4 The Method of Characteristics......Page 688 Projects......Page 696 11.1 Introduction......Page 698 11.2 Existence and Uniqueness......Page 699 11.3 Two-Point Boundary Value Problems for Linear Systems......Page 710 11.4 Sturm-Liouville Boundary Value Problems......Page 722 Project......Page 732 Answers......Page 735 C......Page 788 E......Page 789 F......Page 790 I......Page 791 M......Page 792 P......Page 793 R......Page 794 T......Page 795 Z......Page 796 Integrates the underlying theory, the solution procedures, and the numerical/computational aspects of differential equations in a seamless way. Whenever a new type of problem is introduced, this text begins with the basic existence-uniqueness theory. This provides the student the necessary framework to understand and solve differential equations.