Krdytkyu

In using the embrac package to make parentheses appear upright in emph evironments, I noticed that it did work in most cases, but not in an enumerate environment that appeared in a theorem (where text appears fully slanted).

This is my setup.

documentclass{article}

usepackage{amsmath, amsthm, enumitem}

usepackage{embrac}

newtheorem{lemma}{Lemma}



begin{document}



begin{lemma}

This holds:

begin{enumerate}[label=(roman*)]

    item $a^2+b^2=c^2$.

end{enumerate}

end{lemma}



end{document}

In the (i) in the enumeration, the brackets still appear slanted.

Section 9 Watch Out! of the emrac documentation explains that embrac only applies to emph{...}, but not to {em ...} and {itshape ...}. Since amsthm's lemma uses itshape to typeset its body in italics, embrac can't be used here. It would be a non-trivial (impossible?) exercise to convert embrac's behaviour for the macro emph to the switch itshape, so you will have to find a different work-around. The easiest is to use upshape for the label. Since you use enumitem you can pack that up into a global definition.

documentclass{article}

usepackage{amsmath, amsthm, enumitem}

usepackage{embrac}

newtheorem{lemma}{Lemma}



setlist[enumerate]{label=upshape(roman*)}



begin{document}



begin{lemma}

This holds:

begin{enumerate}

  item $a^2+b^2=c^2$.

end{enumerate}

end{lemma}



end{document}

or define a new list type thmenum

newlist{thmenum}{enumerate}{1}

setlist[thmenum]{label=upshape(roman*)}

and then use it like this

begin{lemma}

This holds:

begin{thmenum}

  item $a^2+b^2=c^2$.

end{thmenum}

end{lemma}

if you want to preserve the original enumerate. The result is the same.