# Min-Max Math, ep. 07: Sets, relations, and functions

### Dots and arrows rule the world of mathematics

For many of us, this is a function:

```
def square(x):
return x*x
```

For others, this is:

For some, this is:

\(f(x) = x^2.\)

In truth, these are all only *representations* of functions, a concept that lies at the core of mathematics.

At their essence, all of the above examples are instances of this:

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