When I was teaching the summer camp in CTY, students started to write:

#### { in **Z**+| < 0} = a really happy negative number

#### { in **Z**+| is even and n is odd} = 2, ( a really odd even number)

I thought it is really cute, I shared it 80 , he came up with some more statment ….

But we will go over **a little math background** first.

is the set of real numbers, which can be thought of as points on an infinitely long line, a *real line*.

is the set of integers, such as

represents the set of Complex numbers, they can be expressed in .

and are Real numbers, and is known as the* imaginary* number, the solution of .

= a real ** complex** number

is a complex ** real** number

is a complex * complex* number

English Teacher: I am imaginary

Math Teacher: is *imaginary*

**Descartes:** I exist because I think.

**Empty set:** I exist because I set.

: I exist because I imagine.

**Lie algebra**: you all go to hell.