## About

cardinality in set

The cardinality denotes the number of elements or cardinality of the set. (ie its size or length)

## Articles Related

## Notation

<MATH>\Large |S|</MATH>

## Example

The set

delim{lbrace}{1,2,3,4}{rbrace}has a cardinality of 4.

## Type

### Finite

A finite set is a set that you can count.

## Rule

If A and B are finite sets then <MATH> \Large |A \times B| = |A| \times |B| </MATH> where x denotes the cross product