/sci/ - Science & Math

Anonymous Tue Feb 18 14:28:10 2020 No.11396758 [View]
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>>11396698
This one too.
>>11396699
Countable union of countables is countable.
The grand trio of Choice, Well-Ordering and Zorn.
[math]X \times X[/math] has the same cardinality as [math]X[/math] if [math]X[/math] is infinite, see https://en.wikipedia.org/wiki/Tarski%27s_theorem_about_choice
Infinite sets are Dedekind infinite. See also the other characterizations here https://en.wikipedia.org/wiki/Dedekind-infinite_set

That's it, I think.

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/sci/ - Science & Math

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