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Jul 30 at 15:33 comment added Babar @GH from MO Thanks, I expressed myself poorly. I meant to say "the best known result" instead of "tight".
Jul 30 at 15:29 comment added GH from MO @Babar The inequalities by Kotnik & te Riele are not tight. It is expected that $\limsup M(x)x^{-1/2}=\infty$ and $\liminf M(x)x^{1/2}=-\infty$. By following my answer you should be able to find a numeric positive lower bound for $\limsup m(x)x^{1/2}$ and a numeric negative upper bound for $\liminf m(x)x^{1/2}$.
Jul 30 at 15:28 vote accept Babar
Jul 30 at 15:25 comment added Babar For the Mertens function $M(x)$, Kotnik & te Riele established: $\limsup M(x)x^{-1/2} > 1.218$, $\liminf M(x)x^{-1/2} < -1.229$. However, analogous tight bounds for $m(x)x^{1/2}$ are unknown to me.
Jul 30 at 15:24 history edited GH from MO
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Jul 30 at 14:56 answer added GH from MO timeline score: 5
Jul 30 at 14:48 comment added David E Speyer See mathoverflow.net/questions/153695 for upper bounds on $|m(x)|$, but that doesn't address lower bounds. (I mistakenly thought this was a duplicate of that one, but it isn't.)
Jul 30 at 14:47 history reopened David E Speyer nt.number-theory
Jul 30 at 14:46 history closed David E Speyer nt.number-theory Duplicate of Reference and best bounds of $\sum_{n\leq x}\frac{\mu(n)}{n}$
Jul 30 at 14:25 history asked Babar CC BY-SA 4.0