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.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.

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

**Functions** assign a single unique output for each of their inputs. In this video, we
see examples of various kinds of **functions**.

www.khanacademy.org/math/algebra/algebra-functions

**Functions** are **mathematical** entities that assign unique outputs to given inputs.
Sounds simple? Think again! In this topic you will evaluate, graph, analyze, and ...

code.wikia.com/wiki/Mathematical_functions

In programming languages **mathematical functions** compute values of "functions"
as defined in the science of mathematics. While functions in programming ...

www.britannica.com/topic/function-mathematics

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

www.thefreedictionary.com/mathematical+function

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

docs.microsoft.com/en-us/sql/t-sql/functions/mathematical-functions-transact-sql

Jul 6, 2017 **...** All **mathematical functions**, except for RAND, are deterministic functions. This
means they return the same results each time they are called with ...