  Three point mass gravitational lens equation is a two-dimensional vector
equation that can be embedded in a tenth order analytic polynomial equation of
one complex variable, and we can solve the one variable equation on the source
trajectories using recipies for Fortran or $C$ (portable for $C$++ or $C_{jj}$)
in Numerical Recipes, or using packages such as Mathemetica, Matlab, etc. This
ready solvability renders fitting microlensing light curves including triple
lenses a normal process, and such was done in a circumbinary planet fit for
MACHO-97-BLG-41. Subsequently, there was a claim that converting the triple
lens equation into the analytic equation was rather cumbersome, and the
impressionable judgement has caused an effect of mysterious impedance around
the perfectly tractable lens equation. There are judgements. Then, there is
nature. We looked up for one of the quantities of highest precision
measurements: electron $g$-factor correction $a_e \equiv g/2-1$. The current
best experimental values of $a_e$ agree to eight significant digits with the
theoretical value, and the theoretical calculation involves more than one
thousand Feynman diagrams -- many orders of magnitude messier than the triple
lens equation coefficients. We seem to have only choice to be compliant to
nature and its appetite for elegant mess and precision numerics. In fact, the
triple lens equation coefficients take up less than a page to write out and are
presented here for users' convenience.
