On Tue, 20 Jan 2009, Marcin Borkowski wrote:
Dnia Sat, Jan 10, 2009 at 07:14:58PM -0500, Aditya Mahajan napisał(a):
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?
(answers cut)
Thank you very much. But one thing still puzzles me: the vertical
distance between the cases. How to increase it? (Shouldn't there be a
parameter for this? But I couldn't find one...)
For matrix, the current definition works hard so that you cannot change
vertical distance. For simultaneous equations, you need a math strucutre
which ConTeXt does not provide.
From what I understand amsmath hasthere are three kinds of math
"strucures"
1. Outer display structures (equation, align, gather, and multline)
2. Inner display structures (aligned, gathered, and multlined (provided by
mathtools package))
3. Inner inline structures (matrix, cases, etc).
The first two display structures have \displaystyle set and have "loose"
spacing. The last inline structure has no \displaystyle set and has
"tight" spacing. So, what you need for simultaneous equations is something
from class 2 with the ability to put a brace on the left (empheq package
in latex allows you to do this with aligned, etc).
Currently, ConTeXt does not provide anything of class 2. It is easy to
provide it (one just needs to copy the definitions of mathalign but not
set the width of hbox to be textwidth), but everytime I start working on
it I get distracted by the bigger problem---ConTeXt is not as good as it
can be for outer display.
Aditya
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