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Cantor sets and numbers with restricted partial quotients
Authors:S. Astels
Affiliation:Department of Pure Mathematics, The University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
Abstract:For $j=1,dots,k$ let $C_j$ be a Cantor set constructed from the interval $I_j$, and let $epsilon _j=pm 1$. We derive conditions under which

begin{equation*}epsilon _1 C_1+dots+epsilon _k C_k = epsilon _1 I_1+dots+epsilon _k I_k quadtext{and}quad C_1^{epsilon _1}dotsb C_k^{epsilon _k}= I_1^{epsilon _1}dotsb I_k^{epsilon _k}.end{equation*}

When these conditions do not hold, we derive a lower bound for the Hausdorff dimension of the above sum and product. We use these results to make corresponding statements about the sum and product of sets $F(B_j)$, where $B_j$ is a set of positive integers and $F(B_j)$ is the set of real numbers $x$ such that all partial quotients of $x$, except possibly the first, are members of $B_j$.

Keywords:Continued fractions   Cantor sets   sums of sets   Hausdorff dimension
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