Sum and mathalignment

[Alexandre Christe via ntg-context <ntg-context@ntg.nl>]

[-- Attachment #1.1.1: Type: text/plain, Size: 723 bytes --]

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!

[-- Attachment #1.1.2: Type: text/html, Size: 977 bytes --]

[-- Attachment #1.2: image.png --]
[-- Type: image/png, Size: 5145 bytes --]

[-- Attachment #2: Type: text/plain, Size: 493 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________