# How to get enumerate numbering by letters, with subsection numbers?

Currently, I am using an unmodified version of the standard enumerate command. The following code gives me labels that go "1.", "2.", "3."

\section{Section}
\subsection{Subsection}
\begin{enumerate}
\item
\item
\item
\end{enumerate}


I would like the labels to go "1.1.A.", "1.1.B.", "1.1.C." instead. (And of course, that they be set up in such a way that the numbers change in the expected manner for later sections and subsections.) In particular, I'm trying to copy the exercise numbering in this document.

How can I accomplish this?

## 1 Answer

It's easy with enumitem:

\documentclass{article}
\usepackage{enumitem}

\newenvironment{enumyikes}
{\begin{enumerate}[label=\thesubsection.\Alph{*},leftmargin=*,align=left]}
{\end{enumerate}}

\begin{document}

\section{Section}

\subsection{Subsection}

\begin{enumyikes}
\item First
\item Second
\item Third
\end{enumyikes}

\end{document}


Usual recommendation: are you really sure this is what you want to inflict to your readers?

The picture was obtained with \usepackage{showframe}

• enumyikes!?? yikes! – user11232 Sep 23 '15 at 16:02
• Perhaps adding a conditional, so in case there's no subsection only the section counter is prepended? – Gonzalo Medina Sep 23 '15 at 16:07
• Thanks! I'm writing a solutions document to some notes with exercises that are labeled this way. – Potato Sep 23 '15 at 16:14
• Is there any way to get the labels to be left-aligned, like the exercises in the following document? (Warning: large .pdf) math.stanford.edu/~vakil/216blog/FOAGsep1815public.pdf – Potato Sep 23 '15 at 16:17
• (When I try your code, the left edges of the labels seem to vary in position.) – Potato Sep 23 '15 at 16:20