Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.



Re: Cannot get inverse of y=x/logx to work
Posted:
May 30, 2011 2:42 AM


On Sun, 30 May 2011, Chris Richardson wrote: > On Mon, 30 May 2011 15:16:32 +1000, Brad Cooper wrote: > >> I cannot get the correct result for the inverse calculation of y = >> x/log(x). > > Equations of this type are solvable in terms of the > Lambert function: > > x = y * W(1/y), where W is the Lambert function > W(y) is the solution to y = xe^x; W(y).e^W(y) = y.
You claim yW(1/y)/log(yW(1/y) = y.
How so?



