Set Theory - Cardinality (Finite/Infinite Size)
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
<m>delim{lbrace}{1,2,3,4}{rbrace}</m>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