Discrete Mathematics
# Set Notation

In terms of cardinality, are there more rational or irrational numbers?

The number of "Figure 8's" that you can draw in a plane such that they do not cross each other is...

Let $\Bbb Z_2[x]$ denote the set of polynomials with integer coefficients modulo 2.

What is $|\Bbb Z_2[x]|$?

**True or False?**

The cardinality (size) of the set of natural numbers $1,2,3,\ldots$ is same as the as the cardinality (size) of the set of even numbers $-4,-2,0,2,4,\ldots$.