[Math] Add argmin command

dist/recommended.tex

@@ -452,6 +452,7 @@
 
 % other useful shortcuts
 \newcommand{\8}{\infty}
+\newcommand{\argmin}{\text{argmin}}
 \newcommand{\dx}{\text{ d}}
 \newcommand{\floor}[1]{\left\lfloor #1 \right\rfloor}
 \newcommand{\ceil}[1]{\left\lceil #1 \right\rceil}