# Fluent (mathematics)

A **fluent** is a time-varying quantity or variable.^{[1]} The term was used by Isaac Newton in his early calculus to describe his form of a function.^{[2]} The concept was introduced by Newton in 1665 and detailed in his mathematical treatise, *Method of Fluxions*.^{[3]} Newton described any variable that changed its value as a fluent – for example, the velocity of a ball thrown in the air. The derivative of a fluent is known as a fluxion, the main focus of Newton's calculus. A fluent can be found from its corresponding fluxion through integration.^{[4]}

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## ReferencesEdit

**^**Newton, Sir Isaac (1736).*The Method of Fluxions and Infinite Series: With Its Application to the Geometry of Curve-lines*. Henry Woodfall; and sold by John Nourse. Retrieved 6 March 2017.**^**Fluent (mathematics) at the*Encyclopædia Britannica***^**Weisstein, Eric W. "Fluent".*MathWorld*.**^**"Isaac Newton (1642-1727)".*www.mhhe.com*. Retrieved 6 March 2017.