deletions | additions       diff --git a/begin_equation_tau_n_sum__.tex b/begin_equation_tau_n_sum__.tex  index 0cfad53..fcea471 100644  --- a/begin_equation_tau_n_sum__.tex  +++ b/begin_equation_tau_n_sum__.tex 
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\begin{equation*}  \tau(n) \mathrm{T}(n)  = \sum \frac{(a-b)(a-c)(a-d)(a-e)(b-c)(b-d)(b-e)(c-d)(c-e)(d-e)}{1!\,2!\,3!\,4!}\nonumber \end{equation*}