\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{ottmath}[2023/09/03]

\newcommand{\diff}{\, d}
\newcommand{\pdiff}{\, \partial}
\newcommand{\od}[3][]{\frac{d{}^{#1}#2}{d{#3}^{#1}}}
\newcommand{\pd}[3][]{\frac{\partial{}^{#1}#2}{\partial{#3}^{#1}}}

\newcommand\pvec[1]{\vec{#1}\,'}
\newcommand\Del{\vec{\nabla}}

\newcommand\eval[1]{\Big| _{#1}}

\renewcommand\mid{\;
\ifnum\currentgrouptype=16
    \middle|
\else
    |
\fi\;}