In calculus, an antiderivative, primitive or indefinite integral of a function f is a function F whose derivative is equal to f, i.e., F ′ = f. The process of solving for antiderivatives is antidifferentiation (or indefinite integration).
They are also called integrals, but this usage is not universally
accepted. Antiderivatives are related to definite integrals through the
fundamental theorem of calculus, and provide a convenient means for
calculating the definite integrals of many functions.