Differential | Calculus, Equations, Solutions | Britannica
https://www.britannica.com/science/differential-mathematics
Webdifferential, in mathematics, an expression based on the derivative of a function, useful for approximating certain values of the function. The derivative of a function at the point x 0, written as f′(x 0), is defined as the limit as Δx approaches 0 of the quotient Δy/Δx, in which Δy is f(x 0 + Δx) − f(x 0).
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