Skip to main content
8 events
when toggle format what by license comment
May 22, 2011 at 3:21 comment added Peter Humphries @Qiaochu: What I mean is that the heurestic given by Ng (see near the end of cs.uleth.ca/~nathanng/RESEARCH/mobius2b.pdf) is justified by theoretical evidence in line with other, more accepted conjectures (Riemann hypothesis, linear independence hypothesis, and discrete moments of L-functions), in comparison to other conjectured growth rates of $\sum_{n < x}{\mu(n)}$, which, as Ng discusses, can vary greatly.
May 21, 2011 at 7:40 comment added Qiaochu Yuan What does it mean for a conjecture to be better than another conjecture?
May 21, 2011 at 4:45 comment added Douglas Zare Since it's community wiki, I corrected the statements.
May 21, 2011 at 4:43 history edited Douglas Zare CC BY-SA 3.0
changed estimates in first paragraph; deleted 107 characters in body
May 21, 2011 at 4:32 comment added Peter Humphries What's interesting here is that the best conjecture so far on the size of $\sum_{n < x}{\mu(n)}$ is by Ng, which is that these sums are only greater than $C \sqrt{x} (\log \log \log x)^{5/4}$ infinitely often, but not any function that grows faster. So there's a bit of a disparity between the probabilistic model and the real thing.
May 20, 2011 at 21:35 comment added Felipe Voloch @Mark: You are probably right, thanks.
May 20, 2011 at 21:25 comment added Mark Lewko I think you need a bound of $O_{\epsilon}(x^{1/2 + \epsilon})$ to be equivalent to RH. (In the probabilistic model, the law of the iterated logarithm suggests the partial sums will be greater than $O((x\ln \ln(x) )^{1/2})$ infinitely often.)
May 20, 2011 at 21:08 history answered Felipe Voloch CC BY-SA 3.0