Cardinality in mathematics
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Basically, cardinality refers to the size of a set (i.e. how many elements, or “things”, are in a set). For example, suppose you have the set {A,B,C}. There are 3 elements in the set (A, B, and C), so the set’s cardinality is 3.
In this example, the cardinality is a finite number. However, cardinality doesn’t *have* to be finite. The set of all natural numbers — {1,2,3,4,…..} — has infinitely many numbers in it, so it’s cardinality is also infinite.
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