Subset/Examples/Even Numbers form Subset of Integers
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Example of Subset
The set of even integers forms a subset of the set of integers $\Z$.
Sources
- 2010: Raymond M. Smullyan and Melvin Fitting: Set Theory and the Continuum Problem (revised ed.) ... (previous) ... (next): Chapter $1$: General Background: $\S 3$ A non-denumerable set