Re: Math alignment problem

[Aditya Mahajan <adityam@umich.edu>]

On Sat, 10 Jan 2009, Marcin Borkowski wrote:

> Hi all,
>
> I'd like to typeset a system of simultaneous equations.  I want it to
> have a brace on the left (like "cases"), but inside I want it to have
> two columns aligned like "align".  Also, I'd like to have the vertical
> space between the equations be small (like in cases), not so big as in
> align.
>
> How to do this?

I do not completely understand what you want. Do the following give the 
desired output.

\starttext

\startformula
   \startcases[align={right,left},distance=3pt]
     \NC 2x + 3y \MC{} = 10 \NR
     \NC 3x + 2y \MC{} = 5   \NR
   \stopcases
\stopformula

\startformula
   \startmatrix[align={right,left},distance=3pt,left={\left\{}, 
right={\right.}]
     \NC 2x + 3y \NC{} = 10 \NR
     \NC 3x + 2y \NC{} = 5   \NR
   \stopmatrix
\stopformula

\stoptext

The {} after the alignment \NC is useful if the next symbol is something 
that can be a uniary or binary symbol (eg, + or -). The {} tells tex to 
treat is as a binary symbol.

If you frequently need something like this, you can use 
definemathcases/definemathmatrix to define a new environment with 
appropriate parameters.

Aditya
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