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May 22, 2019 at 8:44 comment added Fedor Petrov @YCor yes, your understanding is correct, and Fedja's comment actually contains the answer: $a(N)$ behaves as $\log(N)/N$.
May 22, 2019 at 8:43 history edited Fedor Petrov CC BY-SA 4.0
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May 22, 2019 at 8:15 comment added YCor What is meant by "always"? for every $\mu$? is my understanding correct: for given $\mu$, define $b_\mu=\sup_R|\mu(R)-\lambda(R)|$, and $a(N)$ is defined as $\inf_\mu b_\mu$?
May 22, 2019 at 7:44 comment added fedja Just look at pdfs.semanticscholar.org/a39e/… and references therein, if necessary, to get an idea of the current state of art. In dimension 2, the problem is settled completely, but in higher dimensions there is a gap between the powers of $\log$ in the lower and the upper bounds.
May 22, 2019 at 7:42 history edited YCor
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May 22, 2019 at 7:17 history asked Fedor Petrov CC BY-SA 4.0