Definition:Countably Infinite/Cardinality
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Definition
The cardinality of a countably infinite set is denoted by the symbol $\aleph_0$ (aleph null).
Sources
- 1972: A.G. Howson: A Handbook of Terms used in Algebra and Analysis ... (previous) ... (next): $\S 4$: Number systems $\text{I}$: A set-theoretic approach