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Classifying Differential Equations by Order

Part of the Differential Equations For Dummies Cheat Sheet

The most common classification of differential equations is based on order. The order of a differential equation simply is the order of its highest derivative. You can have first-, second-, and higher-order differential equations.

First-order differential equations involve derivatives of the first order, such as in this example:

image0.png

Second-order differential equations involve derivatives of the second order, such as in these examples:

image1.png

Higher-order differential equations are those involving derivatives higher than the second order (big surprise on that clever name!). Differential equations of all orders can use the y' notation, like this:

image2.png
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