Lambert W function aproximation
I noticed that $\ln(x)-\ln(\ln(x))$ seems to by asymptotic with the Lambert W Function. Is this true?
By definition:
$$x=W(x)e^{W(x)}$$
It thus follows that
$$e^{W(x)}=\frac x{W(x)}$$
$$W(x)=\ln\left(\frac x{W(x)}\right)$$
By applying the fixed point method, we find that for any initial condition greater than $e$ and $x>e$, we have
$$W(x)=\ln\left(\frac x{W(x)}\right)=\ln\left(\frac x{\ln\left(\frac x{W(x)}\right)}\right)=\dots=\ln\left(\frac x{\ln\left(\frac x{\ln\left(\frac x{\vdots}\right)}\right)}\right)$$
And by expanding with log rules with some obvious bounds on $W(x)$, we find that
$$W(x)\sim\ln(x)-\ln(\ln(x)-\ln(\ln(x)-\ln(\dots)))\sim\ln(x)-\ln(\ln(x))+o(1)$$
Here is a visualization of this with the dotted line being the Lambert W function: