Definition:Aleph Number/Historical Note
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Historical Note on Aleph Number
The concept and notation of aleph numbers are due to Georg Cantor.
He defined the notion of cardinality.
He was the first to realize that infinite sets can have different cardinalities.
Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): aleph-null
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): aleph-null