Differential Equations I
www.math.toronto.edu › selick › B44A differential equation (de) is an equation involving a function and its deriva-tives. Differential equations are called partial differential equations (pde) or or-dinary differential equations (ode) according to whether or not they contain partial derivatives. The order of a differential equation is the highest order derivative occurring.
ELEMENTARY DIFFERENTIAL EQUATIONS
ramanujan.math.trinity.edu › wtrench › textsfocuses the student’s attention on the idea of seeking a solutionyof a differential equation by writingit as yD uy1, where y1 is a known solutionof related equation and uis a functionto be determined. I use this idea in nonstandardways, as follows: In Section 2.4 to solve nonlinear first order equations, such as Bernoulli equations and nonlinear