Question

Define cardinal number of set?

Answer 1

cardinal number of set means that
The number of distinct elements in a finite set is called its cardinal number. For example, the set {1, 2, 3} has three distinct elements, so its cardinal number is 3. The set {1, 2, 2, 3} has four elements but only three distinct elements (1,2,3) since 2 is repeated; so its cardinal number is also 3.
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Answer 2

In mathematics Cardinal numbers or cardinal for short, are the generalisation of the numbers use to measure the cardinality of a finite set is a natural number : the numbers of elements in set.it also describes the size of infinite sets ....

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