First
Summary
A set of first category is the same as a meager set: one that is the union of a countable number of nowhere-dense sets.
An ordinal of the first class is a finite ordinal
An ordinal of the first kind is a successor ordinal
First-order logic allows quantification over elements of a model, but not over subsets
Further reading
- Wikipedia, page 43580500, revision 1360947732, Glossary of set theory, section F. adopted
About this page
| Tag | T07RRJ3AHF |
|---|---|
| URI | m2://T07RRJ3AHF |
| Kind | concept |
| Writing | W1 stated |
| Changed | 4 November 2026 |
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What this page needs for W2
- edge defines in: at least one definition (0 of 1)
- edge instance_of in: at least two examples (0 of 2)
- edge not_instance_of in: at least one non-example (0 of 1)
- edge specializes both: the more general notions and the special cases (0 of 1)
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