[NTG-context] Missing \dddot and \ddddot

[Hans Hagen]

Aditya Mahajan wrote:
> On Thu, 14 Sep 2006, WN wrote:
>
>   
>> Hello,
>> I need to use \dddot and \ddddot in one of my documents, does anyone
>> know how to
>> define these math symbols.
>>     
>
> The trouble is that most fonts do not contain these accents. 
> amsmath.sty gets over this definition by faking these symbols. It is 
> easy to port these definitions to context.
>
> amsmath.sty definition
>
> \newcommand{\dddot}[1]{%
>    {\mathop{#1}\limits^{\vbox to-1.4\ex@{\kern-\tw@\ex@
>     \hbox{\normalfont ...}\vss}}}}
> \newcommand{\ddddot}[1]{%
>    {\mathop{#1}\limits^{\vbox to-1.4\ex@{\kern-\tw@\ex@
>     \hbox{\normalfont....}\vss}}}}
>
>
> Converting to context
>
> %--------------------%<------------------------------------
> \unprotect
>
> % The true copy of amsmath definitions
> \def\amsdddot {\limits^{\vbox to -1.4ex{\kern-2ex\hbox{\the\textfont\z@ ...}\vss}}}
> \def\amsddddot{\limits^{\vbox to -1.4ex{\kern-2ex\hbox{\the\textfont\z at ....}\vss}}}
>
> % I do not understand why you need to give negative height
>   
\setbox\scratchbox{..} \ht\scratchbox0pt \dp\scratchbox-2pt

> % This looks better.
> \def\amsdddot {\limits^{\vbox{\kern-2ex\hbox{\the\textfont\z@ ...}\vss}}}
> \def\amsddddot{\limits^{\vbox{\kern-2ex\hbox{\the\textfont\z at ....}\vss}}}
>
> \def\dddot #1{{\mathop{#1}\amsdddot }}
> \def\ddddot#1{{\mathop{#1}\amsddddot}}
>
> \protect
>
> \starttext
>
> $\dddot{a}_{\dddot{b}}$
>
> $\ddddot{a}_{\ddddot{b}}$
> \stoptext
> %------------------------%<-------------------------------------
>
> Aditya
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>   


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