Who first introduced the concept of mathematical functions?
History of the function concept
Gottfried Leibniz
The term "function" was literally introduced by Gottfried Leibniz, in a 1673 letter, to describe a quantity related to points of a curve, such as a coordinate or curve's slope.[9]
Johann Bernoulli started calling expressions made of a single variable "functions."
In 1698, he agreed with Leibniz that any quantity formed "in an algebraic and transcendental manner" may be called a function of x.[10]
By 1718, he came to regard as a function "any expression made up of a variable and some constants."[11] Alexis Claude Clairaut (in approximately 1734) and Leonhard Euler introduced the familiar notation 




f
(
x
)



{\displaystyle {f(x)}}

 for the value of a function.[12]