Function vs Relation
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Functions versus Relations

Discusses the concept of functions versus relations, and demonstrates ways of telling the difference. Covers the Vertical Line Test, along with how to know if a formula is a function even without the graph.
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Function (mathematics) - Wikipedia, the free encyclopedia

Function (mathematics) - Wikipedia, the free encyclopedia

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. An example is the function that relates each real number x to its square x 2.

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The Wolfram Functions Site

The Wolfram Functions Site | Function vs Relation | Scoop.it
The world's largest collection of formulas and graphics about more than 300,000 mathematical functions for the mathematics and science communities.
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