kardinaliarvo
Kardinaliarvo, or cardinal value, is a term most often used in mathematics to denote the cardinality or size of a set. The cardinality of a finite set is the exact number of elements it contains, denoted |A|. For infinite sets, cardinal numbers extend this idea to measure how many elements there are in a larger sense. Two sets are equinumerous if there exists a bijection between them, meaning they have the same cardinality.
In set theory, cardinal numbers form a hierarchy. The set of natural numbers has cardinality denoted ℵ0
Cardinal arithmetic differs from ordinary arithmetic when infinities are involved. For infinite cardinals κ and λ, the sum
In some contexts outside pure math, kardinaliarvo can also refer to a numerical value on a cardinal