Enumeration in theorem environment

Question

I am puzzled with a formating question. I was asked to change that the enumeration gives me italic numbers in the theorem environment to non-italic ones. How can customize enumeration, such that it will not adopt the italic format of the theorem environment? Sorry for my bad English. Thanks in advance.

Answer 1

The enumitem package makes it easy to customize lists, so I’ll use that. The code below is just for a single list, but you could use \setlist to make it global. See the documentation for details.

\documentclass{article}

\usepackage{amsthm,enumitem}
\newtheorem{theorem}{Theorem}

\begin{document}

\begin{theorem}
    The following are equivalent:
    \begin{enumerate}[font=\normalfont]
        \item $1 + 1$
        \item $2$
    \end{enumerate}
\end{theorem}

\end{document}