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