On the dimension of $\alpha \beta$-sets

We show that the Feng-Xiong lower bound of $1\mathrm{/}2$ for the box dimension of $\alpha \beta$-sets is tight. We also study how much of an $\alpha \beta$-orbit ``carries the dimension’': deleting an arbitararily small positive density set of times can cause the box dimension to drop to zero, but the Assouad dimension cannot drop below $1\mathrm{/}4$.