Differential Equations I
Differential Equations IMATB44H3FVersion September 15, 2011-1949iiContents1 Preliminaries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sample Application of Differential Equations . . . . . . . . . . .22 First Order Ordinary Differential Separable Equations . . . . . . . . . . . . . . . . . . . . . . . . . Exact Differential Equations . . . . . . . . . . . . . . . . . . . . . Integrating Factors. . . . . . . . . . . . . . . . . . . . . . . . . . Linear First Order Equations . . . . . . . . . . . . . . . . . . . . Substitutions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bernoulli Equation. . . . . . . . . . . . . . . . . . . . . . Homogeneous Equations . . . . . . . . . . . . . . . . . . . Substitution to Reduce Second Order Equations to FirstOrder. . . . . . . . . . . . . . . . . . . . . . . . . . . . .203 Applications and Examples of First Orderode Orthogonal Trajectories. . . . . . . . . . . . . . . . . . . . . . . Exponential Growth and Decay.
A 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.
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