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A COUNTEREXAMPLE TO A CONTINUED FRACTION CONJECTURE

Published online by Cambridge University Press:  25 January 2007

Ian Short
Affiliation:
Department of Mathematics, Logic House, National University of Ireland, Maynooth, Maynooth, Co. Kildare, Ireland (ian.short@nuim.ie)
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Abstract

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It is known that if $a\in\mathbb{C}\setminus(-\infty,-\tfrac14]$ and $a_n\to a$ as $n\to\infty$, then the infinite continued fraction with coefficients $a_1,a_2,\dots$ converges. A conjecture has been recorded by Jacobsen et al., taken from the unorganized portions of Ramanujan’s notebooks, that if $a\in(-\infty,-\tfrac14)$ and $a_n\to a$ as $n\to\infty$, then the continued fraction diverges. Counterexamples to this conjecture for each value of $a$ in $(-\infty,-\tfrac14)$ are provided. Such counterexamples have already been constructed by Glutsyuk, but the examples given here are significantly shorter and simpler.

Type
Research Article
Copyright
Copyright © Edinburgh Mathematical Society 2006