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

The above definition of "a function from X to Y" is ... With one definition saying the
function defined by f(x) = x<sup>2</sup> ...

tutorial.math.lamar.edu/Classes/Alg/FunctionDefn.aspx

This seems like an odd definition but we'll need it for the definition of a function (
which is the main topic of this section). However, before we actually give the ...

mathworld.wolfram.com/Function.html

of values at which a function is defined is called its domain, while the set f(A) ...
Ch. 27 in Handbook of Mathematical Functions with Formulas, Graphs, and ...

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

Functions assign a single unique output for each of their inputs. In this video, Sal
gives many examples of various kinds of functions. ... If you're seeing this
message, it means we're having trouble loading external resources ... Functions (
algebra)

www.icoachmath.com/math_dictionary/function.html

Function is a relation in which each element of the domain....complete
information about the function, definition of an function, examples of an function,
step by ...

www.regentsprep.org/regents/math/algtrig/atp5/lfunction.htm

Relations and Functions. ... Definition of a Relation ... Function: A function is a set
of ordered pairs in which each x-element has only ONE y-element associated ...

www.thefreedictionary.com/mathematical function

Define mathematical function. mathematical function synonyms, mathematical
function pronunciation, mathematical function translation, English dictionary ...

www.mathopenref.com/function.html

Functions - how they transform one value into another in a defined way.

www.virtualnerd.com/algebra-1/relations-functions/functions/linear-nonlinear

You can't go through algebra without learning about functions. This tutorial shows
you the definition of a function and gives you an example of a function. Take a ...

study.com/academy/lesson/function-table-in-math-definition-rules-examples.html

Functions can be represented in four different ways. In this lesson, we will learn
what a function table is, and how and when to use a function...