Skip to main content\(\newcommand{\vect}[1]{\boldsymbol{#1}}
\newcommand{\closure}[1]{\overline{#1}}
\DeclareMathOperator{\graph}{graph}
\DeclareMathOperator{\Int}{int}
\DeclareMathOperator{\grad}{grad}
\DeclareMathOperator{\area}{area}
\DeclareMathOperator{\volume}{vol}
\DeclareMathOperator{\curl}{curl}
\DeclareMathOperator{\divergence}{div}
\newcommand{\lt}{<}
\newcommand{\gt}{>}
\newcommand{\amp}{&}
\definecolor{fillinmathshade}{gray}{0.9}
\newcommand{\fillinmath}[1]{\mathchoice{\colorbox{fillinmathshade}{$\displaystyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\textstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptscriptstyle\phantom{\,#1\,}$}}}
\)