Chapter 81
A short course on differential equations. By Donald Francis Campbell. Maxmillan company. London. 1907

81.1 Chapter I. Introduction. Exercises at page 13
81.2 Chapter II. Change of variable. Exercises at page 20
81.3 Chapter III. Ordinary differential equations of the first order and first degree. Exercises at page 33
81.4 Chapter IV. Ordinary linear differential equations with constant coefficients. Exercises at page 48
81.5 Chapter IV. Ordinary linear differential equations with constant coefficients. Exercises at page 58
81.6 Chapter V. Homogeneous linear differential equations. Exact equations. Exercises at page 69
81.7 Chapter VI. Certain particular forms of equations. Exercises at page 74
81.8 Chapter VII. Ordinary differential equations in two dependent variables. Exercises at page 86