\[\newcommand{\vect}[1]{\vec{\boldsymbol{#1}}}
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\newcommand{\norm}[1]{\lVert#1\rVert}
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\newcommand{\mat}[1]{\boldsymbol{\underaccent{\bar}{#1}}} % For LaTeX
\renewcommand{\mat}[1]{\boldsymbol{#1}}
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\renewcommand{\d}{\mathrm{d}}
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% These replace SIunitx. They should not be defined in LaTeX.
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\]
