Definition:Cardinal/Informal Definition
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Definition
A natural number considered as an indication of the size of a set is referred to as a cardinal number.
Also see
- Results about cardinals can be found here.
Sources
- 2010: Raymond M. Smullyan and Melvin Fitting: Set Theory and the Continuum Problem (revised ed.) ... (previous) ... (next): Chapter $5$: Ordinal Numbers: $\S 1$ Ordinal numbers