[Tex/LaTex] Wrong subsections numbering

numberingsectioning

I have a weird problem. My subsections are numbered like this:

Chapter 1: Subsection 1.0.1 Subsection 1.0.2 Subsection 1.0.3

Chapter 2: Subsection 2.0.4 Subsection 2.0.5

…

Chapter X: Subsection X.0.

I have no idea how to start fixing this error. The only warning I get is:

Chapter1.tex(1): Underfull \vbox (badness 10000) has occurred while \output is    activepdfTeX warning (ext4): destination with the same identifier (name{page.1}) has been       already used, duplicate ignored
Chapter1.tex(26): destination with the same identifier (name{page.2}) has been already used, duplicate ignored

but I doubt it has anything to do with the problem.
Appreciate any ideas.

Best Answer

You are using the sectioning commands \chapter (level 0) and \subsection (level 2), but not the "in-between" command \section (level 1). This is rather uncommon and possibly a misunderstandng on your part.

If you insist on using \subsection this way, you have to reset the subsection counter manually immediately after the start of a new \chapter. See Resetting theorem counters: \section and (missing) \subsection for an explanation.

\documentclass{report}

\begin{document}

\chapter{bla}

\setcounter{subsection}{0}

\subsection{blubb}

\chapter{foo}

\setcounter{subsection}{0}

\subsection{bar}

\end{document}

Related Solutions

[Tex/LaTex] titlesec, hyperref, algorithm2e, and \appendix

It's always good to load hyperref last. (But you're right, that won't solve your problem.) I think the main source of the problem is algorithm2e. Based on this discussion (in German) here, it seems that there are a few possible solutions. The simplest two are:

Add

\renewcommand*{\theHsection}{\thesection}

after loading hyperref.

add

\let\chapter\undefined

after loading algorithm2e.

\documentclass{article}
\usepackage{titlesec}
\usepackage{algorithm2e}
\let\chapter\undefined % use this line
\usepackage[]{hyperref}
%\renewcommand*{\theHsection}{\thesection} % or this one
\begin{document}
\section{foo}
\appendix
\section{bar}
\end{document}

[Tex/LaTex] part with setcounter — destination with the same identifier

Redefining the internal presentation of the section counter for hyperref helps, for example:

\renewcommand*{\theHsection}{\thepart.\thesection}

The error came because the section counter is not unique, you have two sections with the number 1, one in each part. The redefinition above makes the internal presentation to 1.2 and 2.1, thus unique and allowing unique hyperlinks, not visible in the output.

The error would also go away if you number section per part, for example

\usepackage{amsmath}% perhaps you already use it
\numberwithin{section}{part}

\usepackage{chngcntr}
\counterwithin{section}{part}

So if you refer to section 1 it's clear if the one of Part 1 or Part II is meant.

Best Answer

Related Solutions

[Tex/LaTex] titlesec, hyperref, algorithm2e, and \appendix

[Tex/LaTex] part with setcounter — destination with the same identifier

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