# Braket and breqn formatting issues [closed]

I ran into a problem formatting things with breqn and the braket style file. A minimal example that illustrates the problem is:

\documentclass{article}

\usepackage{braket}
\usepackage{breqn}

\begin{document}

This does not format correctly

\begin{dmath}
\ket n = (C) = A + B
\end{dmath}

However, this does
\begin{dmath}
\ket n = C = A + B
\end{dmath}

\end{document}


The output of which is:

While in the above example the parentheses are mathematically unnecessary, in the more complicated example I found this in, I need them.

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## closed as too localized by egreg, Stefan Kottwitz♦Oct 29 '11 at 9:31

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I get the same result for both lines, using breqn.sty 2009/08/07 v0.98a. Could you check your version by adding \listfiles in your preamble and looking near the end of the .log file? – Jake Oct 10 '11 at 23:16
Oh, how silly of me. I thought I was up to date, but it turns out I was keeping an old 2008 version in my texmf folder. When I deleted it, I get breqn.sty 2009/08/07 v0.98a and my problem is fixed. – thequark Oct 11 '11 at 15:18
What's the proper etiquette for this post? Do I keep it as is, edit it to highlight my oversight in versions of breqn, or delete it entirely? – thequark Oct 11 '11 at 15:48
Others might disagree with me, but I'd recommend you answer your own question explaining the steps to determine the problem -- I am sure you are not the only one to encounter such problems. – Peter Grill Oct 11 '11 at 16:19