Does newcommand and DeclareMathOperator work without backslash?
$\DeclareMathOperator{Aut}{Aut}$ $\Aut(X)$
$\newcommand{Lim}{\operatorname{Lim}}$ $\Lim x_n$
$\def{\Cov}{\operatorname{Cov}}$ $\Cov (X)$
Does newcommand and DeclareMathOperator work without backslash?
$\DeclareMathOperator{Aut}{Aut}$ $\Aut(X)$
$\newcommand{Lim}{\operatorname{Lim}}$ $\Lim x_n$
$\def{\Cov}{\operatorname{Cov}}$ $\Cov (X)$