Changes

f(x;\alpha,\beta,\sigma) = \beta\frac{\alpha}{2}\,e^{\alpha x+\frac{\alpha^2\sigma^2}{2}}\left[1-Erf\left(\frac{x+\alpha\sigma^2}{\sqrt{2}\sigma}\right)\right] </math><br>

f(x;\alpha,\beta,\sigma) = \beta\frac{\alpha}{2}\,e^{\alpha x+\frac{\alpha^2\sigma^2}{2}}\left[1-Erf\left(\frac{x+\alpha\sigma^2}{\sqrt{2}\sigma}\right)\right] </math><br>

:: <math> + \frac{1-\beta}{\sqrt{2\pi}\sigma}e^{-\frac{x^2}{2\sigma^2}}\\

:: <math> + \frac{1-\beta}{\sqrt{2\pi}\sigma}e^{-\frac{x^2}{2\sigma^2}}\\

\end{eqnarray}}</math>

</math>

: This function is normalized to unity and is described by two parameters:

: This function is normalized to unity and is described by two parameters: