On the number of integers with boundedly many non-zero digits with
respect to different Ostrowski expansions
March 2, 2020
1:00 pm PHG 646
Abstract
It has been previously proved that the number of integers for which
the number of digits in each of the base-\(\theta\) and base-\(\psi\)
expansions lies below a fixed bound is finite if and only if 1,
\(\theta\) and \(\psi\) are \(\mathbb{Q}\)-linearly independent. In this
talk, we prove various results which lead us to showing that the
number of integers which have finitely many digits in the Ostrowski
expansions with respect to irrational numbers \(\alpha = \frac{1 +
\sqrt{5}}{2}\) and \(\beta = \frac{3 + \sqrt{13}}{2}\) is bounded. This
is joint work with Alan Haynes.
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