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I'd like to get a list with the label $\mathscr{G}_1$, where G_1 is the first item in the list.

If I use

\newenvironment{enumeratescr}{\begin{enumerate}
                    [labelindent=\parindent, leftmargin=*,
                    label=$\mathscr{G}_1:$, noitemsep]}
                    {\end{enumerate}}

then all the items in the list start with G_1. How do I fix this?

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Welcome to TeX.SE. Please keep in mind that while code snippets are useful in explanations, it is always best to compose a fully compilable MWE that illustrates the problem including the \documentclass and the appropriate packages so that those trying to help don't have to recreate it. –  Peter Grill Apr 1 '12 at 14:24
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3 Answers 3

\usepackage{enumitem}
\newenvironment{enumeratescr}
  {\begin{enumerate}[labelindent=\parindent,
                     leftmargin=*,
                     label=$\mathscr{G}_{\arabic*}$:,
                     noitemsep
                    ]}
  {\end{enumerate}}

The current item number can be accessed with \arabic* (or other number representation commands).

The colon should go outside the formula, as it's not part of it. Take the habit of writing \mathcal{X} or \mathbf{A} and not \mathcal X.

(And, please, don't use non standard commands in a code snippet unless you provide also their definition or the packages necessary for them: nobody can know what \mathscr is supposed to do, as it's not a standard command.)

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Thanks. Sorry, I forgot to change \mscr to \mathscr. That was indeed helpful. –  nearim Apr 1 '12 at 13:41
1  
@nearim Also \mathscr is not a standard command. :) –  egreg Apr 1 '12 at 13:43
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\documentclass{article}   
\usepackage[mathscr]{eucal}
\usepackage{enumitem}
\newlist{enumeratescr}{enumerate}{10}
\setlist[enumeratescr]{labelindent=\parindent, leftmargin=*,
                    label*=$\mathscr{G}_\arabic*$:, noitemsep}
\begin{document}

\begin{enumeratescr}
  \item foo
  \item bar
\end{enumeratescr}

\end{document}

enter image description here

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You need to specify the label with the regular enumitem syntax:

\begin{enumerate}[label={$\mathscr{G}_{\arabic*}$:}]
\item Foo
\item Bar
\item FooBar
\end{enumerate}
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