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cardinality 基數 基數 cardinality 基準; 基數 cardinality n 1: (mathematics) the number of elements in a set or group (considered as a property of that grouping) have the same number of elements (i.e. there is a {bijection} between them) then they have the same cardinality. A cardinality is thus an {isomorphism class} in the {category} of sets. {aleph 0} is defined as the cardinality of the first {infinite} {ordinal}, {omega} (the number of {natural numbers}). (1995-03-29)
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