deletions | additions       diff --git a/untitled.tex b/untitled.tex  index ef9de2f..7807b26 100644  --- a/untitled.tex  +++ b/untitled.tex 
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\begin{equation}  I_2(\mu, \sigma) = \int_{-\mu}^{0} \frac{(f'+\mu)}{\sqrt{2\pi}\sigma}\exp\left(-\frac{f'^2}{2\sigma^2}\right)df' \\  \end{equation}  \begin{equation}  I_2(\mu, \sigma) = \int_{-\mu}^{0} \frac{f'}{\sqrt{2\pi}\sigma}\exp\left(-\frac{f'^2}{2\sigma^2}\right)df' + \mu {\rm erf} \left( \frac{\mu}{\sqrt{2}\sigma} \right) \\  \end{equation}  ===  \begin{equation}