\documentclass[9pt]{book}
\usepackage{amsmath,amssymb}
\pagestyle{plain}
\usepackage{lipsum}
\begin{document}
\twocolumn
\section{Introduction}
Once upon a time.
In the case of a collection of course documents or a connected series of articles---possibly including some on remote computers, it is convenient to use web-based access to the archived resources, as is in operation with the page you are now reading. Accordingly, the working example of this page is an easily understood template that you can modify to provide access to your
\lipsum[3-56]
\end{document}
Thanx,
Ben
Last edited by cgnieder on Tue Jul 08, 2014 11:15 am, edited 1 time in total.
Best to use twocolumn as global option, if the whole document ist to be typeset in twocolumn mode or use package multicol if only parts should be twocolumn.
\documentclass[%twocolumn,
9pt%not usable with standard book
]{book}
\usepackage{amsmath,amssymb}
\pagestyle{plain}
\usepackage{lipsum}
\usepackage[english]{babel}
\usepackage{microtype}
\usepackage{multicol}
\begin{document}
%\twocolumn
\begin{multicols}{2}
\section{Introduction}
Once upon a time.
In the case of a collection of course documents or a connected
series of articles---possibly including some on remote computers,
it is convenient to use web-based access to the archived
resources, as is in operation with the page you are now reading.
Accordingly, the working example of this page is an easily
understood template that you can modify to provide access to your
\lipsum[3-6]
\end{multicols}
\end{document}
The smart way: Calm down and take a deep breath, read posts and provided links attentively, try to understand and ask if necessary.