deletions | additions       diff --git a/DeclareMathOperator_argmin_argmin_newcommand_reals__.tex b/DeclareMathOperator_argmin_argmin_newcommand_reals__.tex  index 54c69e7..09d5589 100644  --- a/DeclareMathOperator_argmin_argmin_newcommand_reals__.tex  +++ b/DeclareMathOperator_argmin_argmin_newcommand_reals__.tex 
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f(m) = \| \Fu m - y\|^2_{\ell_2} + \lambda \| \Psi m\|_{\ell_1}  \end{equation}  The derivativeof $f$ at $m$, defined  $Df(m)$(a $1 \times m$ matrix),  is \begin{equation}  Df(m) = D\| \Fu m - y\|^2_{\ell_2} + D\lambda \| \Psi m\|_{\ell_1}  \end{equation}