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Hyperelliptic curves, continued fractions, and Somos sequences. (English) Zbl 1221.11015
Denteneer, Dee (ed.) et al., Dynamics and stochastics. Festschrift in honor of M. S. Keane. Selected papers based on the presentations at the conference ‘Dynamical systems, probability theory, and statistical mechanics’, Eindhoven, The Netherlands, January 3–7, 2005, on the occasion of the 65th birthday of Mike S. Keane. Beachwood, OH: IMS, Institute of Mathematical Statistics (ISBN 0-940600-64-1/pbk). Institute of Mathematical Statistics Lecture Notes - Monograph Series 48, 212-224 (2006).
The author details the continued fraction expansion of the square root of monic polynomials of even degree. It is well known that each step of the continued fraction expansion corresponds to addition of the divisor at infinity on the relevent elliptic or hyperelliptic curve. In the quartic and sextic cases he observes explicitly that the parameters appearing in the expansion yield integer sequences defined by relations including and generalizing that of the sequence $$\dots, 3,2,1,1,1,1,1,2,3,5,11,37,83,\dots$$ produced by the recursive definition $$B_{h+3}=(B_{h-1}B_{h+2}+B_h B_{h+1})/B_{h-2}$$.
For the entire collection see [Zbl 1113.60008].

##### MSC:
 11A55 Continued fractions 11G05 Elliptic curves over global fields 14H05 Algebraic functions and function fields in algebraic geometry 14H52 Elliptic curves
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