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Enumerating the Rationals

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 .

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For a more in-depth discussion of the countability of positive rational numbers, see this article.

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"Enumerating the Rationals" from the Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/EnumeratingTheRationals/
Contributed by: Matthew Szudzik
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