chapter 1 Parabolic Equations with One Space Variable -- chapter 2 Parabolic Equations with Two or More Space Variables -- chapter 3 Hyperbolic Equations with One Space Variable -- chapter 4 Hyperbolic Equations with Two or Three Space Variables -- chapter 5 Elliptic Equations with Two Space Variables -- chapter 6 Elliptic Equations with Three or More Space Variables -- chapter 7 Equations Involving Mixed Derivatives and Some Other Equations -- chapter 8 Second�Order Equations of General Form -- chapter 9 Third�Order Equations -- chapter 10 Fourth­Order Equations -- chapter 11 Equations of Higher Orders.