Furstenberg's intersection conjecture for multiplicatively independent dynamics

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Let p,q≥2p,q\ge 2 be integers with p≁qp\nsim q, where a≁ba\nsim b means that log⁡a/log⁡b∉Q\log a/\log b\notin\mathbb Q. Let Tm:[0,1]→[0,1]T_m:[0,1]\rightarrow[0,1] be the map x↦mxmod  1x\mapsto mx\mod 1, and let dim⁡H\dim_{\rm H} denote Hausdorff dimension. A closed set is TmT_m-invariant when it is invariant under TmT_m. Furstenberg's intersection conjecture. If Ap,Bq⊂[0,1]A_p,B_q\subset[0,1] are closed and invariant under TpT_p and TqT_q, respectively, then for all real numbers uu and vv,

dim⁡H((uAp+v)∩Bq)≤max⁡{0,dim⁡HAp+dim⁡HBq−1}.\dim_{\rm H}((uA_p+v)\cap B_q)\le \max\{0,\dim_{\rm H}A_p+\dim_{\rm H}B_q-1\}.

The paper states that this conjecture is proved there, so it is a solved form of Furstenberg's transversality problem for the two multiplicatively independent maps.

References

Primary source

Meng Wu, “A proof of Furstenberg's conjecture on the intersections of p and q-invariant sets”, arXiv:1609.08053 (2019).

Additional references

3 papers in this index state this conjecture (2009–2016). The statement above is taken from the most recent of them; the others are arXiv:1609.07802, arXiv:0910.1956.

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