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Number unit, Hilbert Space, Quantum Number Theory.
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header.tex
\newcommand{\ket}[1] {| {#1} \rangle} \newcommand{\bra}[1] {\langle {#1} |} \newcommand{\braket}[2] {\langle {#1} | {#2} \rangle} \newcommand{\ketbra}[2] {\ket{#1}\bra{#2}} \newcommand{\braoket}[3]{\langle {#1} | {#2} | {#3} \rangle}