\newcommand{\R}{\mathbb{R}}
\newcommand{\norm}[1]{\left\lVert #1 \right\rVert}
\renewcommand{\vec}[1]{\mathbf{#1}}
\def\foo{bar}
\DeclareMathOperator{\argmin}{arg\,min}
\newenvironment{remark}{\par\noindent\textbf{Remark.}}{\par}
\newenvironment{wrap}{\begin{center}}{\end{center}}
\NewDocumentEnvironment{boxed}{O{gray}}{\begin{center}}{\end{center}}
