\[\newcommand{\vect}[1]{\vec{\boldsymbol{#1}}}
\newcommand{\uvect}[1]{\hat{\boldsymbol{#1}}}
\newcommand{\abs}[1]{\lvert#1\rvert}
\newcommand{\norm}[1]{\lVert#1\rVert}
\newcommand{\I}{\mathrm{i}}
\newcommand{\ket}[1]{\left|#1\right\rangle}
\newcommand{\bra}[1]{\left\langle#1\right|}
\newcommand{\braket}[1]{\langle#1\rangle}
\newcommand{\Braket}[1]{\left\langle#1\right\rangle}
\newcommand{\op}[1]{\boldsymbol{#1}}
\newcommand{\mat}[1]{\underline{\boldsymbol{#1}}}
\providecommand{\d}{\mathrm{d}}
\renewcommand{\d}{\mathrm{d}}
\newcommand{\D}[1]{\mathcal{D}[#1]\;}
\newcommand{\pdiff}[3][]{\frac{\partial^{#1}#2}{\partial{#3}^{#1}}}
\newcommand{\diff}[3][]{\frac{\d^{#1} #2}{\d{#3}^{#1}}}
\newcommand{\ddiff}[3][]{\frac{\delta^{#1} #2}{\delta{#3}^{#1}}}
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\DeclareMathOperator{\sinc}{sinc}
\DeclareMathOperator{\sn}{sn}
\DeclareMathOperator{\cn}{cn}
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\DeclareMathOperator{\diag}{diag}
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% These replace SIunitx. They should not be defined in LaTeX.
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\newcommand{\per}{/}
\newcommand{\tera}{T}
\newcommand{\giga}{G}
\newcommand{\mega}{M}
\newcommand{\kilo}{k}
\newcommand{\milli}{m}
\newcommand{\micro}{μ}
\newcommand{\nano}{n}
\newcommand{\kilogram}{\text{kg}\,}
\newcommand{\meter}{\text{m}\,}
\newcommand{\second}{\text{s}\,}
\newcommand{\ampere}{\text{A}\,}
\newcommand{\kelvin}{\text{K}\,}
\newcommand{\mol}{\text{mol}\,}
\newcommand{\candela}{\text{cd}\,}
\newcommand{\newton}{\text{N}\,}
\newcommand{\hertz}{\text{Hz}\,}
\newcommand{\pascal}{\text{Pa}\,}
\newcommand{\volt}{\text{V}\,}
\newcommand{\watt}{\text{W}\,}
\newcommand{\joule}{\text{J}\,}
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\newcommand{\coulomb}{\text{C}\,}
\newcommand{\ohm}{\Omega\,}
\newcommand{\weber}{\text{Wb}\,}
\newcommand{\tesla}{\text{T}\,}
\newcommand{\degree}{\text{deg}\,}\]
