Connectedness of fractals associated with Arnoux-Rauzy substitutions
  Rauzy fractals are compact sets with fractal boundary that can be associated with any unimodular Pisot irreducible substitution. These fractals can be defined as the Hausdorff limit of a sequence of compact sets, where each set is a renormalized projection of a finite union of faces of unit cubes. We exploit this combinatorial definition to prove the connectedness of the Rauzy fractal associated with any finite product of three-letter Arnoux-Rauzy substitutions. 
Val\'erie Berth\'e, Timo Jolivet, Anne Siegel
math.CO cs.DM