It can be shown that the total number of real numbers (that is, numbers including fractions, pi, etc.) is different to the total number of whole numbers (1,2,3,etc.). So how is the second of these, the total number of whole numbers, described?
Aleph0. Aleph is the first letter of the Hebrew alphabet, and it is used with a subscript to describe these two kinds of infinity. Other infinities are described Aleph1, Aleph2, and so on. The total number of real numbers might be equal to Aleph1 - but all that is known for sure is that it is at least Aleph1 - it might be more!
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