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I am using the book class for a document, but I would like to add the section numbering to every section heading, similar to how report works.

For example, the document defined by

\documentclass[12pt,letterpaper]{book}

\begin{document}
   \chapter{A Chapter}
      \section{A Section}
         \subsection{A Subsection}
\end{document}

Appears as

Chapter 1

A Chapter

A Section

A Subsection

I would like it to appear as

Chapter 1

A Chapter

1.1 A Section

1.1.1 A Subsection

On a side note, these sections are numbered correctly in the table of contents.

  • 2
    Welcome to TeX.SE. Your request is actually the default setting for book, at least for section levelling down to \subsection. Running your example I see the section etc. numbered as 1.1, 1.1.1 ... etc. You're using something that prevents this. However, \setcounter{secnumdepth}{5} in the preamble should work, meaning that even \subparagraph will be numbered then – user31729 Feb 20 '18 at 18:25
  • Thanks, I had added the titlesec package, which supressed it. – Davidallen353 Feb 20 '18 at 19:09
  • titlesec, .... sigh ........ – user31729 Feb 20 '18 at 19:10
  • I don't recall why I had titlesec (removing it did nothing). Is there a particular reason that I should avoid it in the future? – Davidallen353 Feb 20 '18 at 19:21
  • It's not my favorite package, to be polite ;-) (And the downvote to your answer is not by me, however) – user31729 Feb 20 '18 at 19:22
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I had accidentally included a package (titlesec) that caused the behavior that I did not want. Thank you Christian Hupfer for pointing this out.

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