A set can be anything. {1, 2, 3} is a set of the first 3 counting numbers. It's also the first three positive integers. The the set of the smallest positive whole numbers.
{1,2,3,4,5....}
46781
A_{x\x are set of days in a week}
Set examples.
set of real number....
describing of one object
There are many examples of a pulley system such as a drawbridge in a castle or a set of rock climbing gear
I am a kid, so I might not nail it, but some examples are the dragon curve and julia set.
Fables of aesop set 2
When you get a lighter and some paper then you set the paper on fire.
*Set Designer
The set of positive numbers, the set of negative numbers are two examples. Any subsets of these will also not be closed.