\documentclass{article}
\usepackage{amsmath}
\usepackage[active,tightpage,auctex,dvips]{preview}
\usepackage{fontspec}
\usepackage{ifxetex}
\usepackage{syd-plex}
\usepackage{quiver}
\usepackage{tikz-cd}

\begin{document}
\setlength\abovedisplayskip{0pt}
% {{contents}}
\end{document}