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added 132 characters in body
Martin Sleziak
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Does newcommand and DeclareMathOperator work without backslash?

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

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

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