\documentclass{article}12% set font encoding for PDFLaTeX or XeLaTeX3\usepackage{ifxetex}4\ifxetex5\usepackage{fontspec}6\else7\usepackage[T1]{fontenc}8\usepackage[utf8]{inputenc}9\usepackage{lmodern}10\fi1112% used in maketitle13\title{Title of Document}14\author{Name of Author}151617% Enable SageTeX to run SageMath code right inside this LaTeX file.18% documentation: http://mirrors.ctan.org/macros/latex/contrib/sagetex/sagetexpackage.pdf19% \usepackage{sagetex}2021\begin{document}2223test this is CoCalc\cite{CoCalc}.2425\bibliography{bib}26\bibliographystyle{alpha}272829\end{document}30313233