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What (who) is differential calculus - definition
=x^2 with a tangent line drawn to (2,4).png?width=200 "The graph of <math>y=x^2</math>, with a straight line that is tangent to <math>(2,4)</math>. The slope of the tangent line is equal to <math>4</math>. (Note that the axes of the graph do not use a 1:1 scale.)")
![The mean value theorem: For each differentiable function <math>f:[a,b]\to\R</math> with <math>a<b</math> there is a <math>c\in(a,b)</math> with <math>f'(c) = \tfrac{f(b) - f(a)}{b - a}</math>.](https://commons.wikimedia.org/wiki/Special:FilePath/Mvt2.svg?width=200 "The mean value theorem: For each differentiable function <math>f:[a,b]\to\R</math> with <math>a<b</math> there is a <math>c\in(a,b)</math> with <math>f'(c) = \tfrac{f(b) - f(a)}{b - a}</math>.")
Wikipedia
In mathematics, differential calculus is a subfield of calculus that studies the rates at which quantities change. It is one of the two traditional divisions of calculus, the other being integral calculus—the study of the area beneath a curve.
The primary objects of study in differential calculus are the derivative of a function, related notions such as the differential, and their applications. The derivative of a function at a chosen input value describes the rate of change of the function near that input value. The process of finding a derivative is called differentiation. Geometrically, the derivative at a point is the slope of the tangent line to the graph of the function at that point, provided that the derivative exists and is defined at that point. For a real-valued function of a single real variable, the derivative of a function at a point generally determines the best linear approximation to the function at that point.
Differential calculus and integral calculus are connected by the fundamental theorem of calculus, which states that differentiation is the reverse process to integration.
Differentiation has applications in nearly all quantitative disciplines. In physics, the derivative of the displacement of a moving body with respect to time is the velocity of the body, and the derivative of the velocity with respect to time is acceleration. The derivative of the momentum of a body with respect to time equals the force applied to the body; rearranging this derivative statement leads to the famous F = ma equation associated with Newton's second law of motion. The reaction rate of a chemical reaction is a derivative. In operations research, derivatives determine the most efficient ways to transport materials and design factories.
Derivatives are frequently used to find the maxima and minima of a function. Equations involving derivatives are called differential equations and are fundamental in describing natural phenomena. Derivatives and their generalizations appear in many fields of mathematics, such as complex analysis, functional analysis, differential geometry, measure theory, and abstract algebra.
