In mathematics, a cardinal number, or cardinal for short, is a kind of number that measures the cardinality of a set, i.e., how many elements there are in a set. The cardinal number associated with a set A {\displaystyle A} is generally denoted by | A | {\displaystyle \vert A\vert } , with a vertical bar on each side, though it may also be denoted by A {\displaystyle A} , card ( A ) , {\displaystyle \operatorname {card} (A),} or # A .
In mathematics, a cardinal number, or cardinal for short, is a kind of number that measures the cardinality of a set, i.e., how many elements there are in a set. The cardinal number associated with a set A {\displaystyle A} is generally denoted by | A | {\displaystyle \vert A\vert } , with a vertical bar on each side, though it may also be denoted by A {\displaystyle A} , card ( A ) , {\displaystyle \operatorname {card} (A),} or # A .
Source: Wikipedia "Cardinal number" · CC BY-SA 4.0
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