Bijection between 2 sets
Also known as equipollence · equipotence
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6 identifiers linking equinumerosity across the web's reference databases
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In mathematics, cardinality is an inherent property of sets, roughly meaning the number of individual objects they contain, which may be infinite. The concept is understood through one-to-one correspondences between sets. That is, if their objects can be paired such that each object has a pair, and no object is paired more than once.