👉 In mathematics, a cardinal number is a number that can be used to denote properties of sets or other mathematical objects. It is also known as an ordinal number because it represents the order in which things are listed. For example, consider the set of all positive integers (denoted by $\mathbb{Z}$). The cardinality of this set is infinite, since there are infinitely many possible values that can be assigned to each integer. Similarly, the set of all rational numbers (denoted by
