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GENERALIZED CONTINUED FRACTION EXPANSIONS WITH CONSTANT PARTIAL DENOMINATORS

Part of: Diophantine approximation, transcendental number theory

Published online by Cambridge University Press:  21 December 2018

TOPI TÖRMÄ
TOPI TÖRMÄ*
Affiliation:
Research Unit of Mathematical Sciences, P.O. Box 8000, 90014 University of Oulu, Finland email topi.torma@oulu.fi
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Abstract

We study generalized continued fraction expansions of the form

$$\begin{eqnarray}\frac{a_{1}}{N}\frac{}{+}\frac{a_{2}}{N}\frac{}{+}\frac{a_{3}}{N}\frac{}{+}\frac{}{\cdots },\end{eqnarray}$$
where $N$ is a fixed positive integer and the partial numerators $a_{i}$ are positive integers for all $i$. We call these expansions $\operatorname{dn}_{N}$ expansions and show that every positive real number has infinitely many $\operatorname{dn}_{N}$ expansions for each $N$. In particular, we study the $\operatorname{dn}_{N}$ expansions of rational numbers and quadratic irrationals. Finally, we show that every positive real number has, for each $N$, a $\operatorname{dn}_{N}$ expansion with bounded partial numerators.

Keywords

generalized continued fractions

MSC classification

Primary: 11J70: Continued fractions and generalizations
Type
Research Article
Information
Journal of the Australian Mathematical Society , Volume 107 , Issue 2 , October 2019 , pp. 272 - 288
Copyright
© 2018 Australian Mathematical Publishing Association Inc. 

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