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... e continuum problem, namely the question of whether there are any cardinal numbers between the cardinality of countable sets and that of the real number set.
The so-called "cardinal number" refers to the "absolute measure" of a set. If a set has one element, then its cardinality is one; if it has two elements, the cardinality is two. And so on.
The cardinality of infinite countable sets like "all integers" or "all natural numbers" is denoted as "Aleph Zero"—known in Shenzhou as " ...
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