SETS

Definition

What is a set? Well, simply put, it's a collection.

First you specify a common property among "things" (this word will be defined later) and then you gather up all the "things" that have this common property.

For example, the items you wear: these would include shoes, socks, hat, shirt, pants, and so on. I'm sure you could come up with at least a hundred. This is known as a set.

Or another example would be types of fingers. This set would include index, middle, ring, and pinky.

So it is just things grouped together with a certain property in common.

Notation

There is a fairly simple notation for sets. You simply list each element, separated by a comma, and then put some curly brackets around the whole thing.

The curly brackets { } are sometimes called "set brackets" or "braces".

This is the notation for the two previous examples:

{socks, shoes, watches, shirts, ...}
{index, middle, ring, pinky}