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en.wikipedia.org/wiki/Function_(mathematics)

In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output.

www.khanacademy.org/math/algebra/algebra-functions/evaluating-functions/v/what-is-a-function

In programming, the concept of functions came from the idea of functions in mathematics. How they are similar: In math: -You take some input values -You give ...

www.mathsisfun.com/sets/function.html

But we are not going to look at specific functions ... ... instead we will look at the general idea of a function. Names. First, it is useful to give a function a name.

functions.wolfram.com

The world's largest collection of formulas and graphics about more than 300000 mathematical functions for the mathematics and science communities.

reference.wolfram.com/language/tutorial/SomeMathematicalFunctions.html

The Wolfram Language includes a very large collection of mathematical functions . "Mathematical Functions" gives the complete list. Here are a few of the ...

functions.wolfram.com/alphabeticalIndex.html

Search Site. Function Categories · Graphics Gallery · Notations · General Identities About This Site · Contribute · Email Comments · Elementary Functions.

reference.wolfram.com/language/guide/MathematicalFunctions.html

The Wolfram Language has the most extensive collection of mathematical functions ever assembled. Often relying on original results and algorithms developed ...

www.britannica.com/topic/function-mathematics

function: In mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the ...

www.thefreedictionary.com/mathematical+function

Noun, 1. mathematical function - (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an ...