1

I have the warning

destination with the same identifier (name{xtheorem.1}) has been already used, duplicate ignored \relax l.31 \begin{definition}[DefinitionInChapterTwo]

Although there are many questions about "destination with the same identifier", I could not find one according to the identifier xtheorem.

The problem only occurs when I use \begin{definition} in more than one chapter so I think within one chapter, the identifiers are unique but not in the whole document...

Here is my MWE:

\documentclass[twoside, openright, 12pt]{book}

\usepackage[plainpages=false,pdfpagelabels]{hyperref}

\usepackage[titles]{tocloft}
\newlistof[chapter]{theorems}{lthm}{\theoremsname}

\newcommand\addtotheorems[2]{
    \refstepcounter{theorems}
    \addcontentsline{lthm}{theorems}{\protect\numberline{\thetheorems}\textbf{#1:} #2}
}

\usepackage{shadethm}
\newshadetheorem{xtheorem}{Satz}[chapter]
\newshadetheorem{xdefinition}[xtheorem]{Definition}

\newenvironment{definition}[1][]{%
    \addtotheorems{Definition}{#1}
    \begin{xdefinition}[#1]%
    }{\end{xdefinition}}

\begin{document}

\chapter{Title1}
\section{Section 1-1}

\begin{definition}[DefinitionInChapterOne]
\end{definition}

\chapter{Title2}
\section{Section 2-1}

\begin{definition}[DefinitionInChapterTwo]
\end{definition} 

\end{document}

Could you please tell me where I have to make changes to get this issue working?

Update: I figured out that it has something to do with line \newshadetheorem{xtheorem}{Satz}[chapter] This gives me (chapter number).(counter per chapter). But in my mind, this is unique!?! Isn't it? If I change chapter to section, I got a theorem number like 1.1.1 what obviously means (chapter number).(section number).(counter per section)

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Instead of shadethm I'd give a look at tcolorbox. Anyway, you just need to define \theHxtheorem, which hyperref will use for setting anchors.

Load hyperref last.

\documentclass[twoside, openright, 12pt]{book}

\usepackage[titles]{tocloft}
\usepackage{shadethm}

\usepackage[plainpages=false,pdfpagelabels]{hyperref}

\newlistof[chapter]{theorems}{lthm}{\theoremsname}

\newcommand\addtotheorems[2]{% <-- don't forget
    \refstepcounter{theorems}% <-- don't forget
    \addcontentsline{lthm}{theorems}{\protect\numberline{\thetheorems}\textbf{#1:} #2}% <-- don't forget
}

\newshadetheorem{xtheorem}{Satz}[chapter]
\newshadetheorem{xdefinition}[xtheorem]{Definition}
% keep hyperref happy
\newcommand{\theHxtheorem}{\thechapter.\arabic{xtheorem}}

\newenvironment{definition}[1][]
 {\addtotheorems{Definition}{#1}\begin{xdefinition}[#1]}
 {\end{xdefinition}}

\begin{document}

\chapter{Title1}
\section{Section 1-1}

\begin{definition}[DefinitionInChapterOne]
\end{definition}

\chapter{Title2}
\section{Section 2-1}

\begin{definition}[DefinitionInChapterTwo]
\end{definition} 

\end{document}
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4
  • First of all, thank you very much! I really appreciate your help. :-) But I do not understand the actual problem. I've read about, that if \xtheorem is a counter, \thextheorem gives me its current value. But what is \theHxtheorem ? And furthermore: Do I have to check my already existing references because of any possible side effects?
    – lukasl1991
    Commented Apr 5, 2017 at 10:56
  • @lukasl1991 I didn't look at what \newshadedtheorem does. Apparently it doesn't behave with hyperref even if loaded before it. Anyway, if foo is a counter and the command \theHfoo is defined, hyperref will use it for the sole purpose of setting the internal anchor.
    – egreg
    Commented Apr 5, 2017 at 11:46
  • What are these "% <-- don't forget" for?
    – lukasl1991
    Commented Apr 5, 2017 at 12:00
  • @lukasl1991 Avoid spurious spaces in the output.
    – egreg
    Commented Apr 5, 2017 at 12:10

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