Given a finite set A ⊆ S L (2, R) A SL (2, R) we study the dimension of the attractor K A K_ A of the iterated function system induced by the projective action of A A. In particular, we generalise a recent result of Solomyak and Takahashi by showing that the Hausdorff dimension of K A K_ A is given by the minimum of 1 and the critical exponent, under the assumption that A A satisfies certain discreteness conditions and a Diophantine property. Our approach combines techniques from the theories of iterated function systems and Möbius semigroups, and allows us to discuss the continuity of the Hausdorff dimension, as well as the dimension of the support of the Furstenberg measure.
Christodoulou et al. (Thu,) studied this question.
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