# Two columns in Revtex

I am doing a list of problems for my students and I am using Revtex (the AIP template in ShareLaTeX). One of the problems has a lot of small items so I would like it to be in two columns (inside the two column environment).

My idea was to use multicol and then "enumerate". But multicol crashes with Revtex. What should I do?

Here's a little bit of the code: (I included all the packages I am using. Maybe it will be useful in the answer)

\documentclass[
aip,
jmp,
amsmath,amssymb,
reprint,
]{revtex4-1}

\usepackage{dcolumn}
\usepackage{bm}
\usepackage[mathlines]{lineno}
\usepackage[utf8]{inputenc}
\usepackage{amscd}
\usepackage{amsfonts}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage[brazilian]{babel}
\usepackage{mathtools}
\usepackage{enumitem}

\theoremstyle{definition}
\newtheorem{problem}{\\}

\begin{document}

\title{title}

\author{me}

\maketitle

\section*{Level 1}

\begin{problem}
Factor the following expressions:
\begin{enumerate}[label=\alph*)]
\item $a^2+b^2-9c^2-2ab$
\item $a^8-b^2$
\item $4x^4-9x^2+6x-1$
\item $2ab+b^2+a^2-c^2$
\item $a^2+12bc-4b^2-9c^2$
\item $2xy-x^2-y^2+z^2$
\item $-a^2+b^2-c^2+d^2+2ac+2bd$
\item $a^4+a^2b^2+b^4$
\item $a^4+a^2+1$
\item $4b^4-37b^2c^2+9c^4$
\item $16x^4-17x^2y^2+y^4$
\item $64x^4+128x^2y^2+81y^4$
\item $x^4-4a^2x^2+3a^4$
\end{enumerate}
\end{problem}

\end{document}

• Shall the numeration go downwards or from left to right, i.e. a) and b) in one row, then c).... and d)? – user31729 Apr 7 '16 at 20:30
• Downwards. a) is above b). – Gabriel Apr 7 '16 at 20:31
• Your code produces an enumerated list across two balanced columns. If that's not what you want, please state what look you do want to obtain. – Mico Apr 7 '16 at 20:53
• I want two columns of itens inside one major column. – Gabriel Apr 7 '16 at 21:01
• Using tasks will do this simply, but the numbering will be horizontal. – Andrew Swann Sep 13 '17 at 9:44