The first question among Hilbert's twenty-three problems, the cardinality of the continuum.
The 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 "Taoyuan Zero Number," the smallest infinite integer.
The ancients of Shenzhou once believed that the total number of numbers, or the infinitely large, is the number of the way (Tao).
Aleph Zero plus one is still Aleph Zero. Aleph Zero plus Aleph Zero is still Aleph Zero. Aleph Zero times Aleph Zero is still Aleph Zero.
Infinity, positive infinity. Ordinary operations have no meaning for this number at all.
