countable u rečniku PONS

Jednojezični primeri (nisu ih verifikovali PONS urednici)

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An ordinal notation is an effective description of a countable ordinal by a natural number.
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If the axiom of choice holds, then a set is infinite if and only if it includes a countable infinite subset.
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There are really two conditions: the "upwards" and "downwards" countable chain conditions.
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A grammatical distinction is often made between count (countable) nouns such as "clock" and "city", and non-count (uncountable) nouns such as "milk" and "decor".
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However, the product of uncountably many metrizable spaces, each with at least two points, fails to be first countable.
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If not, then the union is even smaller and is therefore also countable by a previous theorem.
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The set of discontinuities of a monotonic function is at most countable.
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The term enumerably infinite means countable using integers perhaps extending to infinity.
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Assuming the axiom of choice, the union of a countable set of countable sets is itself countable.
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While the rational numbers are a countable subset of the reals, for example, the irrational numbers are a cocountable subset of the reals.
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