Re: [NTG-context] \begin{cases} .. \end{cases} in ConTeXt

At 04:58 PM 9/12/2005, Brooks Moses wrote:

At 04:42 PM 9/12/2005, Jilani Khaldi wrote:

...

I have tried with:

\startcases .. \stopcases

and many others variations but I have got only errors. Any hint?

Much like the bmatrix environment, the cases environment is an AMSmath package feature, and ConTeXt at present has very few of the direct equivalents to those implemented. You'll need to make this one up with a Plain TeX \matrix, as well. (The TeXbook is a pretty good reference for this.)

I should follow my own advice! As the TeXbook points out, Plain TeX has a perfectly good \cases command which is also present in ConTeXt, and which you use like this: P_{r-j} = \cases{ 0 & if $r-j$ is odd,\cr r!(-1)^{(r-j)/2} & if $r-j$ is even.\cr } Note that, in this version, the text in the second column is _not_ enclosed in a \text command; the \cases command handles that automatically. In any case, the output is identical to the previous version I gave you, but this is easier to type. - Brooks