Cardinal numbers describe the size of a setor collection, for instance how many dollars or how many days there are. The word cardinal comes from the Latin cardinalis for "most basic" or "most important," which underlines the significance people give to...

1 In set theory the cardinal number of a (finite) set A is the number of elements of A. For example: A={red, orange, yellow, green, blue, indigo, violet}, Card (A)=7. 2 Subset of the numerals: the basic numbers one, two, three,...

In mathematics, cardinal numbers, or cardinals for short, are a generalized kind of number used to denote the size of a set, known as its cardinality. For finite sets the cardinality is given by a natural number, being simply the number of elements in...