On convergence of generalized continued fractions and Ramanujan's conjecture

dc.creatorGlutsyuk, A. A.
dc.date2004-12-22
dc.date2004-12-23
dc.date.accessioned2026-07-07T05:15:34Z
dc.date.available2026-07-07T05:15:34Z
dc.descriptionWe consider continued fractions \frac{-a_1}{1-\frac{a_2}{1-\frac{a_3}{1-...}}} \label{fr} with real coefficients $a_i$ converging to a limit $a$. S.Ramanujan had stated the theorem (see [ABJL], p.38) saying that if $a\neq\frac14$, then the fraction converges if and only if $a<\frac14$. The statement of convergence was proved in [V] for complex $a_i$ converging to $a\in\mathbb C\setminus[\frac14,+\infty)$ (see also [P]). J.Gill [G] proved the divergence of (\ref{fr}) under the assumption that $a_i\to a>\frac14$ fast enough, more precisely, whenever \sum_i|a_i-a|<\infty.\label{gill} The Ramanujan conjecture saying that (\ref{fr}) diverges always whenever $a_i\to a>\frac14$ remained up to now an open question. In the present paper we disprove it. We show (Theorem \ref{th1}) that for any $a>\frac14$ there exists a real sequence $a_i\to a$ such that (\ref{fr}) converges. Moreover, we show (Theorem \ref{go}) that Gill's sufficient divergence condition (\ref{gill}) is the optimal condition on the speed of convergence of the $a_i$'s.
dc.descriptionSubmitted to C.R.A.S. on December 23, 2004
dc.identifierhttps://arxiv.org/abs/math/0412445
dc.identifierhttp://arxiv.org/abs/math/0412445
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/73673
dc.subjectDynamical Systems
dc.subjectComplex Variables
dc.subject37F99
dc.titleOn convergence of generalized continued fractions and Ramanujan's conjecture
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