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Abstract

In the last years considerable attention has been paid to orthogonal projections and non-linear images of self-similar sets. In this paper we consider homothetic self-similar sets in $\mathbb {R}^3$, i.e. the generating IFS has the form $\{\lambda _i\underline {x} +\underline {t} _i\}_{i=1}^q$. We show that if the dimension of the set is strictly greater than $1$ then the image of the set under some non-linear function to the real line has dimension $1$. As an application, we show that the distance set of such a self-similar set has dimension $1$. Moreover, the third algebraic product of a self-similar set with itself on the real line has dimension $1$ if its dimension is at least $1/3$.