> On 7 Jul 2015, at 16:47, Wolfgang Schuster <schuster.wolfg...@gmail.com>
> wrote:
>> I get errors when using \MC - see example below.
>>
> The \NR before \stopmathcases is missing in all your examples.
OK. Though I know it, it is hard to get used to, coming from LaTeX.
>> But the spacing is wrong: too much between the two components. These are not
>> cases, but aligned formulas: one might have a number of alignments, not just
>> one. And I just happen to use left braces on them.
>>
> Take a look at my previous example where I changed the distance between both
> columns with the distance key.
I missed that. It fixes the spaces within the formula, but adds space between
the two sets relative both TeX and AMS-LaTeX (which has about the same as TeX),
cf. example below.
In AMS-LaTeX one can have more than one alignment, though when trying it
between the “-“ and the “ω” in the second (right-most) set, it adds a lot of
space, rather than just trying to align a compactly as possible. In ConTeXt,
nothing happens with extra alignments; in TeX, there is an error.
So using \startmathcases is a workaround: trying to force it to do something it
wasn’t intended for.
----
\starttext
\def\equlb#1{\left\{\eqalign{#1}\right.} %equation left braced
\startformula
J^j:\startmathcases[distance=\spaceamount]\NC ω^0 \MC ↦ 0 \NR \NC ω^j \MC ↦ 0
\NR \stopmathcases \quad
\startmathcases[distance=\spaceamount] \NC ω^k \MC ↦ \MC ω^l \NR \NC ω^l \MC
↦ -\MC ω^k \NR \stopmathcases
\stopformula
\startformula
J^j:\equlb{ω^0 &↦ 0 \cr ω^j &↦ 0} \quad
\equlb{ω^k &↦ ω^l \cr ω^l &↦ -ω^k} \stopformula
\stoptext
----
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