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We consider a class of subsets of the general Sierpinski carpet which is characterized by insisting that the allowed digits in the expansion occur with prescribed mixing group frequencies, determine their Hausdorff dimensions and give the necessary and sufficient conditions for their corresponding Hausdorff measures to be positive and finite.
For β∈(0,12), a middle-(1−2β) Sierpinski carpet Γβ is defined as the self-similar set generated by the iterated function system (IFS) {Fi}4i=1, where Fi:ℝ2→ℝ2 is defined by