deletions | additions       diff --git a/DeclareMathOperator_argmin_argmin_newcommand_reals__.tex b/DeclareMathOperator_argmin_argmin_newcommand_reals__.tex  index d6f79a0..337ac87 100644  --- a/DeclareMathOperator_argmin_argmin_newcommand_reals__.tex  +++ b/DeclareMathOperator_argmin_argmin_newcommand_reals__.tex 
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&=& 2(\Fu m - y)^T \Fu. \nonumber  \end{eqnarray}  To   Lustig et al. used an approximation of the absolute value of a complex number $x \in \complex$ by a smooth function:  \begin{equation}  |x| \approx \sqrt{x*x \sqrt{x^*x  x \ast x + \mu} \nonumber\\ |x| \approx \sqrt{x \ast \sqrt{x^\ast  x + \mu} \nonumber\\ \end{equation}  approximated the absolute value of a complex number $x \in \complex$ as