Text Formatting ⇒ hyperref, mathtools | Cross References to Equations fail

[svend_tveskaeg]

Hi all.

The following MWE is inspired by Heiko Oberdiek's answer in this thread on TeX-Stack-Exchange.

Code: Select all

\documentclass[danish]{article}

\usepackage{babel}
\usepackage{mathtools}
\usepackage{hyperref}

\def\equationautorefname~#1\null{%
  \textsc{Formel}~(#1)\null
}
\addto\extrasdanish{%
  \def\subsectionautorefname{\textsc{Afsnit}}
}

%\mathtoolsset{showonlyrefs}

\begin{document}

\subsection{Triangular number}
\label{tri-numb}
We can choose between
\begin{align}
 \label{rigtig}
  T_{n} &= n^{2} - n + 1,\\
 \label{forkert}
  T_{n} &= \frac{n^{2} + n}{2},
\end{align}
Is \autoref{rigtig} or \autoref{forkert} correct?

\end{document}

This works just as I want but when \mathtoolsset{showonlyrefs} is no longer commented out, the citations are messed up.

How do I fix this?

Thank you in advance!

[localghost]

In my opinion the mathtools option showonlyrefs is only half-baked. The package manual describes two bugs (p. 11f). The first one could be responsible for your trouble here.


Thorsten

[svend_tveskaeg]

Thank you for pointing me to this!

I will (unfortunately) have to remove this from my document.

[cgnieder]

I'm not sure »showonlyrefs« is a good idea anyway. Not to number all equations makes not impossible but very hard for readers to refer to other equations than the ones the author gave a number to. A reference like “The equation three lines below equation (4)” is really not that optimal.

Best Regards

[svend_tveskaeg]

@Clemens:
Good point. However, I am writing a note to my high school students; they do not refer to any equations in my notes themselves---they have a hard enough time understanding the stuff in their textbook, so I just try to write it in another way for them.