(%i65) ex: A * exp(-b * exp(-k * x)) = y $ (%i66) solve(ex,x); (%o66) [x = log(b/log(A/y))/k] On Thu, Nov 18, 2010 at 13:36, Sebastian P. Luque <spluque at gmail.com> wrote: > A * exp(-b * exp(-k * x))