16 of 18 added 132 characters in body

Does newcommand and DeclareMathOperator work without backslash?

$\DeclareMathOperator{Aut}{Aut}$ $\Aut(X)$

$\newcommand{Lim}{\operatorname{Lim}}$ $\Lim x_n$

$\def{\Cov}{\operatorname{Cov}}$ $\Cov (X)$