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To see all available qualifiers, see our documentation.
Some tips.
wikibooks - LaTeX as a manual.
New commands for QM
\newcommand{\ud}[1]{{#1^{\dagger}}}
\newcommand{\bra}[1]{\left\langle #1\right|}
\newcommand{\ket}[1]{\left| #1\right\rangle}
\newcommand\Tr{\mathrm{Tr}}
\newcommand{\braket}[2]{\langle #1 \mid #2 \rangle}
\newcommand\d{\mathrm{d}}
\newcommand\I{\mathbb{I}}
\newcommand{\avg}[1]{\left< #1 \right>}