% SPECIAL FRACTION SETUPS
\newcommand{\pdefrac}[2]{\frac{\partial #1}{\partial #2}}
\newcommand{\pdesfrac}[2]{{\displaystyle{\frac{\partial #1}{\partial #2}}}}
\newcommand{\sfrac}[2]{{\displaystyle{\frac{#1}{#2}}}}
\def\pfrac#1#2{\left( \frac{#1}{#2} \right)}
\def\psfrac#1#2{\left( \displaystyle{\frac{#1}{#2}} \right)}
\def\bfrac#1#2{\left[ \frac{#1}{#2} \right]}
\def\absfrac#1#2{\left| \frac{#1}{#2} \right|}
