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We introduce a technique that uses projection properties of fractal percolation to establish dimension conservation results for sections of deterministic self-similar sets. For example, let   $K$   be a self-similar subset of   $\mathbb {R}^2$   with Hausdorff dimension   $\dim _H K &gt;1$   such that the rotational components of the underlying similarities generate the full rotation group. Then, for all   $\epsilon &gt;0$  , writing   $\pi _\theta $   for projection onto the   $L_\theta $   in direction   $\theta $  , the Hausdorff dimensions of the sections satisfy   $\dim _H (K\cap \pi _\theta ^{-1}x)&gt; \dim _H K - 1 - \epsilon $   for a set of   $x \in L_\theta $   of positive Lebesgue measure for all directions   $\theta $   except for those in a set of Hausdorff dimension 0. For a class of self-similar sets, we obtain a similar conclusion for all directions, but with lower box dimension replacing Hausdorff dimensions of sections. We obtain similar inequalities for the dimensions of sections of Mandelbrot percolation sets.

Dimension Conservation for Self-Similar Sets and Fractal Percolation