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On subsequences of convergents to a quadratic irrational given by some numerical schemes

Benoît Rittaud — 2010

Journal de Théorie des Nombres de Bordeaux

Given a quadratic irrational α , we are interested in how some numerical schemes applied to a convenient function f provide subsequences of convergents to α . We investigate three numerical schemes: secant-like methods and formal generalizations, which lead to linear recurring subsequences; the false position method, which leads to arithmetical subsequences of convergents and gives some interesting series expansions; Newton’s method, for which we complete a result of Edward Burger [] about the existence...

Almost-sure growth rate of generalized random Fibonacci sequences

Élise JanvresseBenoît RittaudThierry de la Rue — 2010

Annales de l'I.H.P. Probabilités et statistiques

We study the generalized random Fibonacci sequences defined by their first non-negative terms and for ≥1, +2= +1± (linear case) and +2=| +1± | (non-linear case), where each ± sign is independent and either + with probability or − with probability 1− (0<≤1). Our main result is that, when is of the form =2cos(/) for some integer ≥3, the exponential growth of for 0<≤1,...

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