Hi, Mikael— In answer to your question: I am one of two editors of *Aestimatio: Sources and Studies in the History of Science*, where the science in question is premodern. As it turns out, our publications tend to the history of mathematics and astronomy (Babylonian, Egyptian, Greco-Roman, Arabic), where the math, though common enough, is pretty much limited to arithmetical computations and trigonometry. The paper that introduced the problem of grouping is actually a lengthy review of a book on Heron’s *Arithmetica*. Your exchanges with Aditya are very interesting and, for me, most informative. Many thanks! Alan On Thu, Oct 10, 2024 at 1:36 AM Mikael Sundqvist wrote: > Hi, > > A. Bowen: The cases are meant for when you divide something into > cases, as in the example below with the absolute value. It is a kind > of inline part of a formula, and I would claim that when you number an > equation, you do not number one case of a cases, but the equation. If > you refer to it, you talk abou "the second line in (1)" if you need to > specify. I also get a bit curious, are you editor of some math journal > that is typeset by ConTeXt? > > A. Braslau: I agree that it is common to put the brace on the left, > but I insist that it makes more sense to put it on the right _if_ you > have equation numbers on the right. If equation numbers are to the > left, it makes sense to put the brace on the left. Nevertheless, to > put the brace on the left side and numbering on the right is possible > (see example below). But the equation number in this case is sitting > in between the two equations, and that is disturbing. If there would > be three lines, one could argue that it would sit on the middle one. > Or not distinguish it from the case where it sits on the middle line. > > The good thing is of course that one can do as one please. > > \starttext > \startformula > \abs{x} = > \startcases > \NC x, \NC x > 0; \NR > \NC 0, \NC x = 0; \NR > \NC -x, \NC x < 0. \NR > \stopcases > \numberhere[eq:foo] > \stopformula > > \startformula > \startalign > [location=packed,fences=cases] > \NC \[21-(9 - n^2)\NC =□^\prime\]\NR > \NC n^2+12 \NC=□^\prime. \NR > \stopalign > \numberhere[eq:foo] > \stopformula > > \stoptext > > /Mikael > > On Thu, Oct 10, 2024 at 2:21 AM Alan Braslau via ntg-context > wrote: > > > > 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 > > > > >> > > > ___________________________________________________________________________________ > > If your question is of interest to others as well, please add an entry > to the Wiki! > > > > maillist : ntg-context@ntg.nl / > https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl > > webpage : https://www.pragma-ade.nl / https://context.aanhet.net > (mirror) > > archive : https://github.com/contextgarden/context > > wiki : https://wiki.contextgarden.net > > > ___________________________________________________________________________________ > > ___________________________________________________________________________________ > If your question is of interest to others as well, please add an entry to > the Wiki! > > maillist : ntg-context@ntg.nl / > https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl > webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) > archive : https://github.com/contextgarden/context > wiki : https://wiki.contextgarden.net > > ___________________________________________________________________________________ >