#enumeratecross-referencingitemizelists
I have a Proposition which consists of an itemize with three claims, i.e.
\begin{prop}
\begin{itemize}
\item[(i)] ...
\item[(ii)] ...
\item[(iii)] ...
\end{itemize}
\end{prop}
I wish to insert labels and references in such a way to get things like
"…due to Proposition 4.1 (ii)…" or similar. How can I do? Should I use enumerate instead of itemize? Thanks.
You should create your own myitemize environment that allows you to do this:
\documentclass{article}
\makeatletter
\newenvironment{myitemize}
{\itemize\@newlistfalse}% \begin{myitemize}
{\enditemize}% \end{myitemize}
\makeatother
\begin{document}
\noindent Here is some text.
\begin{myitemize}% A list with items
\item An item
\item Another item
\end{myitemize}
Here is some more text.
\begin{myitemize}% An empty list
\end{myitemize}
Here is a final piece of text.
\end{document}
The myitemize environment is exactly the same as itemize, except that it (re)sets the boolean condition \@newlistfalse. This is set to true (\@newlisttrue) at the start of a regular list (itemize, enumerate, ...), which causes the error when no \items are used.
This may cause problems with nested lists, although I don't think this fits your use case.
You can adjust the left margin of the lstlisting using the xleftmargin key-value. Setting it to a combination of the list depths from each respective level (-\leftmargini for the first, an additional -\leftmarginii for the second, -\leftmarginiii for the third, etc.), you can push the listing back to the original left margin of the text as if it were set without the list indentations:
\documentclass{article}
\usepackage{listings}
\begin{document}
\noindent
X \dotfill X
\begin{enumerate}
\item Y \dotfill Y
\begin{enumerate}
\item Z \dotfill Z
\begin{lstlisting}[language=C,xleftmargin=\dimexpr-\leftmarginii-\leftmargini]
int main()
{
cout << "hello world" << endl;
}
\end{lstlisting}
\item Z\dotfill Z
\end{enumerate}
\begin{lstlisting}[language=C,xleftmargin=-\leftmargini]
int main()
{
cout << "hello world" << endl;
}
\end{lstlisting}
\item Y \dotfill Y
\end{enumerate}
\noindent
X \dotfill X
\end{document}
The total left margin at any depth is given by \@totalleftmargin. We can utilise this by adjusting xleftmargin in the following way:
<list above>
\begin{lstlisting}[language=C,xleftmargin=\dimexpr-\csname @totalleftmargin\endcsname]
<code>
\end{lstlisting}
<list below>
Best Answer
You could use the enumitem package, with which you could write: