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It seems that the memoir class automatically avoids numbering subsection headings. Chapter and section titles are numbered, but subsection headings contain only the subsection name, and are not prefixed by the subsection number. Why is this the case, and more importantly, how do I turn subsection numbering back on?

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3 Answers 3

up vote 26 down vote accepted

The counter secnumdepth controls "[t]he level number of the least significant sectional unit with numbered headings" (Lamport, LaTeX: A document preparation system , p. 176). The memoir class sets secnumdepth to 1 (section), so you should change this to 2 (subsection). Alternatively, you may use the memoir command \setsecnumdepth.

\documentclass{memoir}

\setcounter{secnumdepth}{2}% alternative A
% \setsecnumdepth{subsection}% alternative B

\begin{document}

\chapter{bla}

\section{blubb}

\subsection{foo}

\end{document}
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Thanks! I had tried setting that in the preamble, but it hadn't worked -- it turned out that \mainmatter resets secnumdepth. Now that I know what to look for, the memoir documentation states that calling \maxsecnumdepth in the preamble sets the numbering level for \mainmatter. –  Rahul Narain Sep 21 '10 at 0:19
    
Just a minor note. If you want the subsection to appear in the TOC as well, you should issue the \maxtocdepth{subsection} command. –  recluze Jan 11 '12 at 3:40
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change the secnumdepth, using the \setcounter{secnumdepth}{2} the following table may help.

Command                            Level        Comment
------------------------------------------------------------------------
\part{part}                        -1       not in letters
\chapter{chapter}                   0       only books and reports
\section{section}                   1       not in letters
\subsection{subsection}             2       not in letters
\subsubsection{subsubsection}       3       not in letters
\paragraph{paragraph}               4       not in letters
\subparagraph{subparagraph}         5       not in letters
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memoir has an easier interface such that people do not need to remember those numbers –  daleif Oct 18 '12 at 10:58
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The correct way to do this, specifically for memoir, IMO, is to use

\setsecnumdepth{subsection}

Why?:

  • It's a higher-level command --- \setcounter is somewhere in the bowels of memoir/LaTeX
  • It's semantic --- saying "subsection" is hopelessly more meaningful than saying "2"
  • It's practical --- it persists across \mainmatter
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