Enumerating the Rationals
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The rational numbers can be arranged in a sequence, so that it is possible to speak of a first rational number, a second rational number, and, in general, an rational number, for any positive integer .
Contributed by: Matthew Szudzik (March 2011)
Open content licensed under CC BY-NC-SA
For a more in-depth discussion of the countability of positive rational numbers, see this article.
"Enumerating the Rationals"
Wolfram Demonstrations Project
Published: March 7 2011