: Mathématiques: aleph number

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aleph number

In mathematics, particularly in set theory, the aleph numbers are a sequence of numbers used to represent the cardinality (or size) of infinite sets that can be well-ordered. They were introduced by the mathematician Georg Cantor and are named after the symbol he used to denote them, the Hebrew letter aleph (ℵ).
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Aleph_number)

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