A subquadratic rational-counting conjecture for the standard Cantor set

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Let CC be the standard Cantor set, and let

N(s,t)=∥{pq∈C:gcd⁡(p,q)=1, s≤q≤t}∥.N(s,t)=\left\|\left\{\frac{p}{q}\in C:\gcd(p,q)=1,\ s\leq q\leq t\right\}\right\|.

Subquadratic rational-counting conjecture. There exists a constant γ<2\gamma<2 such that

N(3n,3n+1)∈O(2γn).N(3^n,3^{n+1})\in O(2^{\gamma n}).

This is introduced as a weaker variant of the preceding rational-counting conjecture, motivated by the extrinsic approximation problem for rationals in the Cantor set. The source gives no resolution of this weaker assertion.

References

Primary source

Ryan Broderick, Lior Fishman and Asaf Reich, “Intrinsic Approximation on Cantor-like Sets, a Problem of Mahler”, arXiv:1106.0526 (2011).

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