I have seen a lot of examples of sets with same cardinality as the natural numbers. For instance the even numbers or the cartesian product. In any case the proof amounted to finding a way of labeling the elements uniquely.(adsbygoogle = window.adsbygoogle || []).push({});

But Im curious - can anyone give me an example of a set, where this is not possible?

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# Cardinality as the natural numbers

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