Chapter 4
Elementary differential equations and boundary value problems, 10th ed., Boyce and DiPrima

4.1 Section 2.1. Page 40
4.2 Section 2.2. Page 48
4.3 Section 2.4. Page 76
4.4 Section 2.5. Page 88
4.5 Section 2.6. Page 100
4.6 Miscellaneous problems, end of chapter 2. Page 133
4.7 Chapter 3, Second order linear equations, 3.1 Homogeneous Equations with Constant Coefficients, page 144
4.8 Chapter 3, Second order linear equations, 3.3 Complex Roots of the Characteristic Equation , page 164
4.9 Chapter 3, Second order linear equations, 3.4 Repeated roots, reduction of order , page 172
4.10 Chapter 3, Second order linear equations, section 3.6, Variation of Parameters. page 190
4.11 Chapter 3, Second order linear equations, 3.7 Mechanical and Electrical Vibrations. page 203
4.12 Chapter 3, Second order linear equations, 3.7 Forced Vibrations. page 217
4.13 Chapter 5.2, Series Solutions Near an Ordinary Point, Part I. page 263
4.14 Chapter 5.3, Series Solutions Near an Ordinary Point, Part II. page 269
4.15 Chapter 7.5, Homogeneous Linear Systems with Constant Coefficients. page 407
4.16 Chapter 7.6, Complex Eigenvalues. page 417
4.17 Chapter 7.8, Repeated Eigenvalues. page 436
4.18 Chapter 7.9, Nonhomogeneous Linear Systems. page 447
4.19 Chapter 9.1, The Phase Plane: Linear Systems. page 505
4.20 Chapter 9.2, Autonomous Systems and Stability. page 517