A function has three general tasks it can perform; it optionally takes an input, does some processing and ... This would then output something like this: [Click on image for larger view.] Figure 1.

Recall that a function can be thought of as a machine which takes an input in (say x) and then depending on what that input is, it returns an output (say y) by some predefined rule (say f). The graph ...

In mathematics, a "well-defined" function is one where there is only 1 output for a given input (as a side note, you can have only single input functions, and still semantically get multiple ...