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I use the enumitem package:

\usepackage[shortlabels]{enumitem}

And I put some numeration like this in a theorem environment with \theoremstyle{plain}:

\begin{prop}
    We have
        \begin{enumerate}[(i)]
            \item $χ(c_M)=-\Id_{σM}$,

        and if $π_0(M)=0$, 
            \item $χ(f_M)=-α_M^{-1}$.
        \end{enumerate}
\end{prop}

the [(i)] after \begin{enumerate} is supposed to make items indexed by (i)(ii)(iii). But in this theorem environment, as texts are italic, the (i)(ii)(iii) become funny things like (i)(ii)(iii). How do I fix it?

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2 Answers

up vote 3 down vote accepted

Instead of using the short labels method, you should specify the label with the key-value syntax that enumitem provides:

\begin{enumerate}[label={\upshape(\roman*)}]
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Thanks. I did a global replacement of \begin{enumerate}[(i)]. Is there a way to make a short hand for this? typing that long string every time is a bit painful. –  hyh Mar 2 '13 at 4:06
    
BTW, what should I replace \begin{enumerate}[a)] with? –  hyh Mar 2 '13 at 4:07
    
OK I put [label=\upshape{\alph*)}] there. –  hyh Mar 2 '13 at 4:16
1  
@hyh Your braces are in the wrong place: this should be label={\upshape\alph*)} \upshape does not take an argument. –  Alan Munn Mar 2 '13 at 4:26
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You can also use the following:

\begin{enumerate}[label={\upshape(\roman*)}, align=left, widest=iii, leftmargin=*]

to get left-aligned roman (i), (ii), (iii), with no leftmargin, and the widest spacing taken to be (iii).

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