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A function must be well defined. This means that every element in the domain maps to only one element in the range. In more math terms, let a and b be in the domain of f such that a = b. If f is a function, then if a = b, f(a) = f(b).

A relation does not need to be well defined. An example of this would be y^2 = 4. y = 2 or -2.

An ordered pair that would be part of a relation but not a function would be (x, y^2) vs an ordered pair possible in a function which would be (x^2, y).

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Q: Example of relation and function
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