About
cardinality in set
The cardinality denotes the number of elements or cardinality of the set. (ie its size or length)
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Notation
<MATH>\Large |S|</MATH>
Example
The set 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