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Apr 11, 2012 at 13:36 answer added David E Speyer timeline score: 10
Jul 10, 2010 at 3:12 answer added Victor Miller timeline score: 3
Jul 9, 2010 at 18:43 answer added Will Jagy timeline score: 3
Jul 9, 2010 at 17:22 comment added Junkie A better source could be Lachaud: iml.univ-mrs.fr/editions/biblio/files/lachaud/1988e.pdf See in particular the example on page 20 for $\sqrt{19}$.
Jul 9, 2010 at 17:05 answer added SandeepJ timeline score: 3
Jul 9, 2010 at 15:14 comment added Robin Chapman Classically this is seen in terms of the relation between continued fractions and cycles of reduced indefinite quadratic forms. For a nice account see chapter 15 of Conway & Sloane's Sphere Packings, Lattices and Groups.
Jul 9, 2010 at 15:09 answer added Dror Speiser timeline score: 3
Jul 9, 2010 at 14:54 history asked David E Speyer CC BY-SA 2.5