Farey sequence
The ’th Farey sequence is the ascending sequence of all rationals .
The first 5 Farey sequences are
1 | |
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2 | |
3 | |
4 | |
5 |
Farey sequences are a singularly useful tool in understanding the convergents that appear in continued fractions. The convergents for any irrational can be found: they are precisely the closest number to on the sequences .
It is also of value to look at the sequences as grows. If and are reduced representations of adjacent terms in some Farey sequence (where ), then they are adjacent fractions; their difference is the least possible:
Furthermore, the first fraction to appear between the two in a Farey sequence is , in sequence , and (as written here) this fraction is already reduced.
An alternate view of the “dynamics” of how Farey sequences develop is given by Stern-Brocot trees.
Title | Farey sequence |
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Canonical name | FareySequence |
Date of creation | 2013-03-22 12:47:16 |
Last modified on | 2013-03-22 12:47:16 |
Owner | ariels (338) |
Last modified by | ariels (338) |
Numerical id | 7 |
Author | ariels (338) |
Entry type | Definition |
Classification | msc 11B57 |
Classification | msc 11A55 |
Related topic | ContinuedFraction |