Re: equivalent to \newcommand{...}{\ensuremath{...}}

["j. van den hoff" <veedeehjay@googlemail.com>]

On Tue, 09 Dec 2014 09:42:03 +0100, Wolfgang Schuster  
<schuster.wolfgang@gmail.com> wrote:

>
>> Am 08.12.2014 um 17:41 schrieb j. van den hoff  
>> <veedeehjay@googlemail.com>:
>>
>> hi list,
>>
>> new to `context' and my first question to the list: how can I achieve  
>> the following (`latex') behaviour:
>>
>> \newcommand{\km}{\ensuremath{K_m}}
>> We can now use \km\ in the body text as well as in this
>> \begin{equation}
>>   \km = 1
>> \end{equation}
>> display equation.
>>
>> in `context'? I've tried something like
>>
>> \def\km{\math{K_m}}
>> We can now use \km\ in the body text but get sytnax errors when
>> putting it in this
>> \startformula
>>   \km = 1
>> \stopformula
>> formula.
>>
>> but this fails for obvious reasons (as would using `$$' instead of  
>> `ensuremath' in the `latex' case).
>>
>> so what I need is a way of defining (potentially complex)  
>> math-expressions via some shortcuts/definitions/macros/abbreviations  
>> (whatever) which I can then use
>> in the formula environment (or whatever it's called in `context'...) as  
>> well as in the body text.
>>
>> any help appreciated,
>
> In ConTeXt you have to write
>
>     \define\km{\mathematics{K_m}}
>
> but there is not much to gain from this because you can enter math mode  
> in the text with \m{…}.

thanks for the response. in my silly example you are right (but even there  
it saves more than 50% of keystrokes). but I'm thinking of course of more  
tedious math expressions where it rapidly is handy to use such  
abbreviations -- the more so, if you have, say, 20 different ones  
appearing repeatedly in the document. but that would work with the  
`\def..\math' construct in the body text. what does _not_ work, then, is  
to use the definition in a display (\startformula...\stopformula) equation  
(which it _does_ in latex when isolating the math expression with  
`ensuremath'). so my real question(s) are:

1. is there any way to achieve the same functionality in `context'  
(expansion of math-containing defintion/macro/abbreviation in text _and_  
math environment? if yes, how would I do this?

2. if no, would it be sensible (and feasible) to modify `\math' behaviour  
and to make it aware of whether it is called from within text or from  
within a display equation (in which case it should do nothing...), i.e.   
mkae it behave like `\ensuremath' in latex?

thx/joerg

>
> Wolfgang
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