As far as I see, when using imaxima, the package breqn.sty
formats the first "(" in the "D" label as a normal-font
bracket and the last one in \texttt, which is the desired style.
The fix is to change lin 193 of breqn.sty to
d\eqnumform#1{\texttt{(}#1\@@italiccorr\texttt{)}} % Add parens
I think this is interesting to get a good output if you are using
larger fonts (in fact, if you use small ones, the problem exists,
but it is more difficult to see).
Hope it helps,
Pedro.
--
Pedro Fortuny Ayuso --------> www.geocities.com/pedro_fortuny
School of Mathematical Sciences. Queen Mary College, Univ. London
Mile End Road, London E1 4NS, UK ------> www.qmul.ac.uk
P.Fortuny@maths.qmul.ac.uk Tfn. Nr. 44 20 7882 5493