Countability
QUESTION
Countability
Click to reveal answer ANSWER
- $\text{card } X = \aleph_0$ if $X$ is equipotent with $\mathbb{N}$.
- $X$ is **countable** if it is the image of $\mathbb{N}$ (i.e., finite or of cardinality $\aleph_0$).
Click to see question - ソースノート: chapter1.md
- カードID: countability
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