**Equation - Wikipedia**
https://en.wikipedia.org/wiki/Equation

OverviewDifferential equationsIntroductionPropertiesAlgebraGeometryNumber theoryTypes of equationsA differential equation is a mathematical equation that relates some function with its derivatives. In applications, the functions usually represent physical quantities, the derivatives represent their rates of change, and the equation defines a relationship between the two. Because such relations are extremely common, differential equations play a prominent role in many disciplines including physics,

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