In mathematics, the cardinality of a set is a measure of the number of elements of the set.
For example, the set $A = {2, 4, 6}$ contains 3 elements, and therefore $A$ has a cardinality of 3.
There are two approaches to cardinality: one which compares sets directly using bijections and injections,
and another which uses cardinal numbers.
<p>In mathematics, the cardinality of a set is a measure of the number of elements of the set.
For example, the set <em>A = {2, 4, 6}</em> contains 3 elements, and therefore <em>A</em> has a cardinality of 3.
There are two approaches to cardinality – one which compares sets directly using bijections and injections,
and another which uses cardinal numbers.
</p>
http://en.wikipedia.org/wiki/Cardinal_number
http://en.wikipedia.org/wiki/Cardinality
In mathematics, the cardinality of a set is a measure of the number of elements of the set. For example, the set 'A = {2, 4, 6}' contains 3 elements, and therefore 'A' has a cardinality of 3. There are two approaches to cardinality – one which compares sets directly using bijections and injections, and another which uses cardinal numbers.