The Hausdorff-measure conjecture for intersections of invariant sets

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Let A2,A3⊂[0,1]A_2,A_3\subset[0,1] be closed sets invariant under multiplication by 22 and 33 modulo 11, respectively, and suppose

dim⁡HA2+dim⁡HA3=s∈(0,1].\dim_{\mathrm{H}}A_2+\dim_{\mathrm{H}}A_3=s\in(0,1].

For g(x)=exp⁡(−(−log⁡x)s)g(x)=\exp(-(-\log x)^s), Hausdorff-measure conjecture. One has

Hg(A2∩A3)=0.\mathcal{H}^g(A_2\cap A_3)=0.

The paper proves the analogous vanishing result in the more restrictive range s<1/27s<1/27 with exponent 27s27s in place of ss; the stated strengthening remains open.

References

Primary source

Han Yu, “An improvement on Furstenberg's intersection problem”, arXiv:1811.11073 (2021).

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