Dear list,
[image: image.png]
What I've done is to play with mathalignment and \framed. Here is a MWE:
\starttext
\defineoverlay[midrule][{\blackrule[height=.02cm,width=5.5cm]}]
\framed[frame=off,background=midrule,boffset=.65cm]{\startformula
\startmathalignment[n=12,align={middle,middle,middle,middle,middle,middle,middle,middle,middle,middle,middle,middle}]
\NC \NC S_6 \NC= \NC 1 \NC+ \NC 2 \NC+ \NC\dots \NC+ \NC 5 \NC+ \NC 6
\NR
\NC + \NC S_6 \NC= \NC 6 \NC+ \NC 5 \NC+ \NC\dots \NC+ \NC 2\NC+ \NC 1
\NR
\NC\NC 2S_6 \NC= \NC 7 \NC+ \NC 7 \NC+ \NC\dots \NC+ \NC 7 \NC+ \NC 7
\NR
\stopmathalignment
\stopformula}
\stoptext
Is there a simpler way to typeset something like this?
Thanks in advance!
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