Author: DavidRoberts Format: MarkdownItexAdded comments about non-equivalence of countable choice and this theorem, as well as countable choice for countable sets.
<a href="https://ncatlab.org/nlab/revision/diff/countable+unions+of+countable+sets+are+countable/8">diff</a>, <a href="https://ncatlab.org/nlab/revision/countable+unions+of+countable+sets+are+countable/8">v8</a>, <a href="https://ncatlab.org/nlab/show/countable+unions+of+countable+sets+are+countable">current</a>
Added comments about non-equivalence of countable choice and this theorem, as well as countable choice for countable sets.
Author: RodMcGuire Format: MarkdownItexfixed bad link `https://proofwiki.org/wiki/Countable_Union_of_Countable_Set`
to `https://proofwiki.org/wiki/Countable_Union_of_Countable_Sets_is_Countable`
<a href="https://ncatlab.org/nlab/revision/diff/countable+unions+of+countable+sets+are+countable/9">diff</a>, <a href="https://ncatlab.org/nlab/revision/countable+unions+of+countable+sets+are+countable/9">v9</a>, <a href="https://ncatlab.org/nlab/show/countable+unions+of+countable+sets+are+countable">current</a>
fixed bad link https://proofwiki.org/wiki/Countable_Union_of_Countable_Set
to https://proofwiki.org/wiki/Countable_Union_of_Countable_Sets_is_Countable