A set with the cardinality of the natural numbers is called "countably infinite".
Source: tatoeba (13644957)
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A set with the cardinality of the natural numbers is called "countably infinite".
Source: tatoeba (13644957)
The empty set has a cardinality of zero.
Source: wiktionary
The cardinality of a set A is the least ordinal α such that there exists a bijection between A and α. We sometimes use the notation #92;alpha#61;#124;A#124; to indicate this.
Source: wiktionary
For fuzzy sets, the concept of set size or cardinality is both richer and more problematic than it is for crisp sets. It is richer because, as we shall see, we may use more than one kind of cardinality.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.