Hello, I also use a square to complete a demonstration. I tried this without success Thank you Fabrice \definesymbol[Fin][\mathematics{\square}] \def\qed{\strut\wordright{\symbol[Fin]}} \defineenumeration [proof] [text=Démonstration, alternative=serried, distance=\zeropoint, number=no, headstyle=boldslanted, width=broad, closesymbol={\symbol[\qed]}] \starttext \startproof \startformula a^2 + b^2 = c^2 \stopformula \stopproof \stoptext Le mar. 4 août 2020 à 14:02, Otared Kavian a écrit :

Hi Hans,

Thanks for the hint which consists in adding an \ifmmode to the definition of \qed. However, as you suggest, one needs some other mechanism in math mode, since with your new definition of \qed the alignment of the formula changes when one adds this close symbol:

%%%% begin-example-qed.tex \definesymbol[Fin][\mathematics{\square}] \def\qed{\ifmmode\quad\symbol[Fin]\else\strut\wordright{\symbol[Fin]}\fi} \starttext \startformula a^2 + b^2 = c^2. \stopformula \startformula a^2 + b^2 = c^2. \qed \stopformula One sees that\type{\qed} in the formula changes the alignment of the formula. \qed \stoptext %%%% end-example-qed.tex

Thanks a lot for everything: Otared

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On 4 Aug 2020, at 13:24, Hans Hagen wrote:

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Thanks Hans for your explanations. The problem I encountered is that, the command \qed is used dozens of time in my text without any issue because it was preceded by something on

On 8/4/2020 11:17 AM, Otared Kavian wrote: th eline, but the only place where it was alone after a formula resulted in the error and it was not easy for me to isolate the issue…

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By the way, in mkii it was possible to add \qed on the last line of a math formula, but that does not work anymore: \definesymbol[Fin][\mathematics{\square}] \def\qed{\strut\wordright{\symbol[Fin]}} \starttext \startformula a^2 + b^2 = c^2. \qed \stopformula The above formula does not show the close symbol.\qed \stoptext Is there a way to have something like \qed work in math formulas? because that's now hwpo wordright works ...

\def\qed{\ifmmode\quad\symbol[Fin]\else\strut\wordright{\symbol[Fin]}\fi}

but we probably need something different, something that hooks into display math

Hans

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