[NTG-context] Re: equation to right margin

It is common, when writing a system of equations, to put a brace on the left. It could make sense to number this system of equations with a single number, on the right and aligned with the right margin. It would also make sense for this number to be aligned with the middle of the two equations of the system. A brace on the right would not introduce the grouping as a system of equations, rather as a pair of equations sharing a common number. Alan On Wed, 9 Oct 2024 12:20:00 -0400 Alan Bowen wrote:

I understand. The reasoning makes sense to me and, as editor of a paper in which this appears, I will ask the author to consider dropping the brace.

I wonder of there is some similar thinking underlying the fact that \startcases... puts the equation number so close to the equation itself and not at a margin (typically right).

Again, many thanks, Mikael. Alan

On Wed, Oct 9, 2024 at 12:12 PM Mikael Sundqvist wrote:

...

Hi,

I think what you ask for was never supported in ConTeXt, for a reason. The idea is that either one groups a set of equations with a brace and numbers them with one number, or one does not group, and then one can number each line separately/independently. Grouping on the left with a brace and numbering one line to the right is, even if we see that often, not really logical.

If there is a large request for doing this, I can talk to Hans about it, maybe it is easy on the code side to support it. But I remember from when we were messing with numbering, and in particular when there are alignments, that it is a bit complicated.

/Mikael

On Wed, Oct 9, 2024 at 5:19 PM Alan Bowen wrote:

...

Thank you, Mikael. That is very helpful and much appreciated.

What I now have is: \startplaceformula \startformula \startalign \NC \[21-(9 - n^2)\NC =□^\prime\] \NR[eq:1] \NC n^2+12 \NC=□^\prime. \NR[eq:2] \stopalign \stopformula \stopplaceformula which put the numbers at the right margin,as I wanted.

So how do I get a brace on the left rather than on the right? Or is

there documentation that explains this?

...

Alan

On Wed, Oct 9, 2024 at 10:22 AM Mikael Sundqvist

wrote:

...

...

Hi,

On Mon, Oct 7, 2024 at 11:45 PM Alan Bowen

wrote:

...

...

I have the following which works, except for the fact that the

equation number does not go to the right margin.

...

\startplaceformula \startformula[align=middle, prefix=no] \startcases[distance=2pt] \NC \[21-(9 - n^2)\NC =□^\prime\]\NR \NC\hfill n^2+12 \NC=□^\prime.\NR[eq04] \stopcases \stopformula \stopplaceformula

I expect that I have missed something pretty basic here, so any

guidance will be greatly appreciated.

Maybe I misunderstand you, but I do not think cases is right here. Also, are you sure you want to group two equations but only number one of them.

If I understand you correctly, I'd try with one of these, depending on if citing the group or one of the equations.

\starttext

\startformula \startalign[location=packed,fences=sesac] \NC \[21-(9 - n^2)\NC =□^\prime\]\NR \NC n^2+12 \NC=□^\prime. \NR \stopalign \numberhere[eq:foo] \stopformula

\startplaceformula \startformula \startalign \NC \[21-(9 - n^2)\NC =□^\prime\] \NR%[eq:bar-a] \NC n^2+12 \NC=□^\prime. \NR[eq:bar-b] \stopalign \stopformula \stopplaceformula

\stoptext

/Mikael