\[\newcommand{\vect}[1]{\vec{\boldsymbol{#1}}}
\newcommand{\uvect}[1]{\hat{\boldsymbol{#1}}}
\newcommand{\abs}[1]{\lvert#1\rvert}
\newcommand{\norm}[1]{\lVert#1\rVert}
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\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}}}
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\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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