Cocountability
Summary
In mathematics, a cocountable subset of a set is a subset whose complement in is a countable set. In other words, contains all but countably many elements of . Since the rational numbers are a countable subset of the reals, for example, the irrational numbers are a cocountable subset of the reals. If the complement is finite, then one says is cofinite.
Further reading
- Wikipedia, page 801119, revision 1360631332, Cocountability. adopted
About this page
| Tag | X2VQ566AVR |
|---|---|
| URI | m2://X2VQ566AVR |
| Aliases | co-countability, co-countable, co-countably, cocountable, cocountable-set, cocountable-subset, cocountably, countable-cocountable-algebra |
| Kind | concept |
| Writing | W1 stated |
| Same as | |
| Changed | 4 November 2026 |
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- 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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