Re: [NTG-context] upload

Hi Aditya and Mikael, Indeed in some situations it is useful to number each equation appearing in formulas grouped with \startcases, and one can construct a structure allowing this, as in the example below which is not satisfactory. I am sure Hans can find a better solution… Here is a working example: % begin math-cases-numbered.tex \definemathmatrix[alignedcases] [align={1:right,2:left,3:left}, distance=3pt, left={\left\{}, right={\right.}, style=\displaystyle] \definereferenceformat[informula] [left=(,right=),text=] \def\eqref#1{\informula[eq:#1]} \starttext Using \type{\startmathfenced} and \type{\startalign} we can number each equation, but the left brace is too far from the formula: \startplaceformula \startformula \startmathfenced[cases] \startalign[n=3,align={1:right,2:left,3:left}] \NC \partial_{tt} u - \Delta u + q(x) u \NC = 0 \NC \quad\text{in }\; (0,T)\times\Omega \NR[+] \NC u \NC = 0 \NC \quad\text{on }\; [0,T]\times\partial\Omega \NR[eq:Dirichlet] \NC u(0,x) \NC = u_{0} \NC \quad\text{in }\; \Omega \NR[+] \NC \partial_{t}u(0,x) \NC = v_{0} \NC \quad\text{in }\; \Omega \NR[+] \stopalign \stopmathfenced \stopformula \stopplaceformula In some situations it is useful to number each equation, for example when we want to say: Indeed we could study the above wave equation with Neumann boundary conditions, that is when \eqref{Dirichlet} is replaced with \startplaceformula[eq:Neumann] \startformula {\partial u \over \partial {\bi n} } = 0 \quad \text{on }\; [0,T]\times\partial\Omega. \stopformula \stopplaceformula Using \type{\startalignedcases} we cannot number each equation\dots \startplaceformula \startformula \startalignedcases \NC \partial_{tt} u - \Delta u + q(x) u \NC = 0 \NC \quad\text{in }\; (0,T)\times\Omega \NR \NC u \NC = 0 \NC \quad\text{in }\; [0,T]\times\partial\Omega \NR \NC u(0,x) \NC = u_{0} \NC \quad\text{in }\; \Omega \NR \NC \partial_{t}u(0,x) \NC = v_{0} \NC \quad\text{in }\; \Omega \NR \stopalignedcases \stopformula \stopplaceformula \stoptext % end math-cases-numbered.tex Best regards: Otared

On 29 Mar 2022, at 18:08, Aditya Mahajan via ntg-context wrote:

On Tue, 29 Mar 2022, Mikael Sundqvist via ntg-context wrote:

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On Tue, Mar 29, 2022 at 6:37 AM Otared Kavian wrote:

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Hi Mikael,

Hi Otared,

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Thanks for your explanation and the example you sent about \definemathsimplealign (I didn’t get immediately that « sesac » in the command \startmathfenced[sesac] means « cases » in reverse or mirrored… I guess this is a wise and humourous choice by Hans :-) ).

I guess so too :)

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Regarding \startcases, it seems that it is still not possible to number each equation, but I may be overlooking something. I’ll try a few examples and will let you know, as well as Hans.

Hm, but a cases environment does not provide several formulas. This is just one formula:

\startformula |x|= \startcases \NC x \NC x>0\NR \NC 0 \NC x=0\NR \NC -x \NC x<0\NR \stopcases \stopformula

and as such should have (at most) one equation number, right?

However, some sub-disciplines like to number each case (for example, if you want to refer to one of them in the future).

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Only Hans knows if it is (easily) doable to add the possibility to add numbers to each three lines.

In the old implementation, this was tricky (the equation without the equation number should be centered, and the equation number should be flush right). But I think that this should be possible with the new low-level box alignment macros.

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