[NTG-context] equation to right margin

[NTG-context] equation to right margin

[Alan Bowen]

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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.

All best,
Alan

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[NTG-context] Re: equation to right margin

[Mikael Sundqvist]

Hi,

On Mon, Oct 7, 2024 at 11:45 PM Alan Bowen <bowenalan03@gmail.com> 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
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___________________________________________________________________________________

[NTG-context] Re: equation to right margin

[Alan Bowen]

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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 <mickep@gmail.com> wrote:

> Hi,
>
> On Mon, Oct 7, 2024 at 11:45 PM Alan Bowen <bowenalan03@gmail.com> 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
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________

[NTG-context] Re: equation to right margin

[Mikael Sundqvist]

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 <bowenalan03@gmail.com> 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 <mickep@gmail.com> wrote:
>>
>> Hi,
>>
>> On Mon, Oct 7, 2024 at 11:45 PM Alan Bowen <bowenalan03@gmail.com> 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
> ___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

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___________________________________________________________________________________

[NTG-context] Re: equation to right margin

[Alan Bowen]

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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 <mickep@gmail.com> 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 <bowenalan03@gmail.com> 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 <mickep@gmail.com>
> wrote:
> >>
> >> Hi,
> >>
> >> On Mon, Oct 7, 2024 at 11:45 PM Alan Bowen <bowenalan03@gmail.com>
> 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
> >
> ___________________________________________________________________________________
>
> ___________________________________________________________________________________
> 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
>
> ___________________________________________________________________________________
>

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[NTG-context] Re: equation to right margin

[Alan Braslau via ntg-context]

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 <bowenalan03@gmail.com> 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 <mickep@gmail.com>
> 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 <bowenalan03@gmail.com>
> > 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
> > > <mickep@gmail.com>
> > wrote:
> > >>
> > >> Hi,
> > >>
> > >> On Mon, Oct 7, 2024 at 11:45 PM Alan Bowen
> > >> <bowenalan03@gmail.com>
> > 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
> > >>
___________________________________________________________________________________
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___________________________________________________________________________________

[NTG-context] Re: equation to right margin

[Mikael Sundqvist]

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
<ntg-context@ntg.nl> 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 <bowenalan03@gmail.com> 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 <mickep@gmail.com>
> > 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 <bowenalan03@gmail.com>
> > > 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
> > > > <mickep@gmail.com>
> > > wrote:
> > > >>
> > > >> Hi,
> > > >>
> > > >> On Mon, Oct 7, 2024 at 11:45 PM Alan Bowen
> > > >> <bowenalan03@gmail.com>
> > > 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
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> ___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

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___________________________________________________________________________________

[NTG-context] Re: equation to right margin

[Otared Kavian]

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Hi Mikael,

My personal experience with numbered equations gathered with a big left curly brace (assuming that the numbers are put to the right of formulas) is that it is very useful (or indispensable…) to be able to number each equation and be able to refer to them. For instance, when one writes a partial differential equation, usually there are boundary conditions, initial conditions and such, which may take 3, 4 or 5 lines of equations (some authors may even have more than that, but I personally avoid it…). It is useful to be able to refer to each of these equations, either by numebring them as subformulas, or numebering them sequentially. It is true that in this case, that is when each line has a number, usually one does not number the whole system of equations gathered by the big left brace. The optimal solution would be to have the option to number each line, or to number them as subformulas.

For instance in the following minimal example (based on one of your answers some time ago), the reference to « eq:Robin » does not work and the numbers of each line of the PDE problem are not correctly aligned to the right.

% begin example alignedcases.tex

\definemathsimplealign[pdeproblem][
left={\startmathfenced[cases]},
right=\stopmathfenced,
align={1:right,2:left,3:left},
strut=yes,
]

\define[1]\eqref{(\in[eq:#1])}
\starttext
A function $u$ is said to be harmonic in $\Omega$ if
\placeformula[eq:Harmonic]
\startformula
\Delta u = 0 \quad\text{in }\, \Omega.
\stopformula
For a given potential $V$ defined on $\partial\Omega$ and a smooth function $\phi$ defined on $\partial\Omega$, study here the PDE
\placeformula 
\startformula
\startpdeproblem
\NC - \Delta u \NC = 0 \NC \qquad\text{in } \Omega \NR[eq:Harmonic-1]
\NC \frac{\partial u}{\partial {\bi n}} \NC = V u + \phi \NC
\qquad\text{on } \partial\Omega \NR[eq:Robin]
\stoppdeproblem
\stopformula

In the above PDE problem, the boundary condition \eqref{eq:Robin} may be replaced by a nonlinear condition such as
\startformula
\frac{\partial u}{\partial {\bi n}} \NC = V u + u^3 \qquad\text{on } \partial\Omega,
\stopformula
while the notion of a harmonic function \eqref{Harmonic} may be replaced with 
\startformula
-{\rm div}(a(x)\nabla u) = 0 \quad\text{in }\, \Omega.
\stopformula

\stoptext

% end example alignedcases.tex

Best regards: Otared

> On 10 Oct 2024, at 07:32, Mikael Sundqvist <mickep@gmail.com> 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
> <ntg-context@ntg.nl> 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 <bowenalan03@gmail.com> 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 <mickep@gmail.com>
>>> 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 <bowenalan03@gmail.com>
>>>> 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
>>>>> <mickep@gmail.com>
>>>> wrote:
>>>>>> 
>>>>>> Hi,
>>>>>> 
>>>>>> On Mon, Oct 7, 2024 at 11:45 PM Alan Bowen
>>>>>> <bowenalan03@gmail.com>
>>>> 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
> ___________________________________________________________________________________

Otared Kavian
e-mail: otared@gmail.com
Phone: +33 6 88 26 70 95





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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

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___________________________________________________________________________________

[NTG-context] Re: equation to right margin

[Aditya Mahajan]

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On Thu, 10 Oct 2024, Otared Kavian wrote:

> Hi Mikael,
> 
> My personal experience with numbered equations gathered with a big left curly brace (assuming that the numbers are put to the right of formulas) is that it is very useful (or indispensable…) to be able to number each equation and be able to refer to them. For instance, when one writes a partial differential equation, usually there are boundary conditions, initial conditions and such, which may take 3, 4 or 5 lines of equations (some authors may even have more than that, but I personally avoid it…). It is useful to be able to refer to each of these equations, either by numebring them as subformulas, or numebering them sequentially. It is true that in this case, that is when each line has a number, usually one does not number the whole system of equations gathered by the big left brace. The optimal solution would be to have the option to number each line, or to number them as subformulas.
> 
> For instance in the following minimal example (based on one of your answers some time ago), the reference to « eq:Robin » does not work and the numbers of each line of the PDE problem are not correctly aligned to the right.

Reference to eq:Robin doesn't work because of the following reason: You define

> \define[1]\eqref{(\in[eq:#1])}

and then use \eqref[eq:Robin] which is then translated to (\in[eq:eq:Robin]). It may be better to use:

\definereferenceformat
  [eqref]
  [left=(, right=), style=normal]


Regarding \startcases number not being to the right edge of the textarea: there is no good solution here. Keep in mind that \startcases is an "inner level" construct, so it is not aware of the width of the outer environment. It is possible to circumvent it on a code-logic level, but we first need to decide how should the following behave:

\startformula
  x(t) = \startcases
    \NC 0, \NC t < 0 \NR
    \NC 1, \NC t \ge 0 \NR[+]
  \stopcases
  \quad\text{and}\quad
  y(t) = \startcases
    \NC 0, \NC t < 0 \NR[+]
    \NC 1, \NC t \ge 0 \NR
  \stopcases
\stopformula

The point is, that \stopcases can be followed by additional text, so placing the number at the right edge may interfere with other things. 

In the example that you sent, the solution presented by Mikael (\startalign[fences=cases]) will work. 

Aditya

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___________________________________________________________________________________
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___________________________________________________________________________________

[NTG-context] Re: equation to right margin

[Alan Bowen]

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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 <mickep@gmail.com> 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
> <ntg-context@ntg.nl> 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 <bowenalan03@gmail.com> 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 <mickep@gmail.com>
> > > 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 <bowenalan03@gmail.com>
> > > > 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
> > > > > <mickep@gmail.com>
> > > > wrote:
> > > > >>
> > > > >> Hi,
> > > > >>
> > > > >> On Mon, Oct 7, 2024 at 11:45 PM Alan Bowen
> > > > >> <bowenalan03@gmail.com>
> > > > 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
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________
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
___________________________________________________________________________________