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countable 形

countable

可数的 kěshǔde

单语范例（未经PONS编辑处理）

英语

While the rational numbers are a countable subset of the reals, for example, the irrational numbers are a cocountable subset of the reals. en.wikipedia.org

Similar expressions are valid for electric charge or any other extensive quantity associated with countable objects. en.wikipedia.org

The set of discontinuities of a monotonic function is at most countable. en.wikipedia.org

The term enumerably infinite means countable using integers perhaps extending to infinity. en.wikipedia.org

More generally, any countable union of null sets is null. en.wikipedia.org

The classification is in terms of countable ordinal numbers. en.wikipedia.org

There are really two conditions: the "upwards" and "downwards" countable chain conditions. en.wikipedia.org

If not, then the union is even smaller and is therefore also countable by a previous theorem. en.wikipedia.org

An equivalent condition is that countable unions of closed sets are closed. en.wikipedia.org

Every countable limit ordinal requires replacement for its construction analogously to 2. en.wikipedia.org

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