# [NTG-context] \triangledown placed too low in Palatino

Hans Hagen pragma at wxs.nl
Tue Apr 15 08:49:42 CEST 2014

```On 4/14/2014 11:30 AM, Sanjoy Mahajan wrote:
>> I can change things but will only do that when all you mathematicians
>> have some agreement about it ...
>
> Otared points out that the distinction between \triangle and
> \bigtriangleup comes from plain TeX.  plain.tex has these definitions:
>
> \mathchardef\triangle="0234
> \mathchardef\bigtriangleup="2234
>
> So \triangle is a math ord and \bigtriangleup a math bin.
>
> For compatibility, that should probably stay true in ConTeXt too---even
> the low placement of \bigtriangledown, which I don't understand but
> which does reproduce plain TeX's placement.

why? if compatibility means 'not useable' we should fix it

>> Btw, it is still on my agenda to provide a mechanism for switching
>> between math dictionaries (i.e. group symbols in group switch if needed
>> different properties) so that one can switch between logic,
>> statistics, streetfighting or whatever math.
>
> Hm, like different dialects of a language.  Plain TeX definitely speaks
> a pure-mathematician dialect.  It would be interesting to see what
> symbol groups are useful in other dialects.

http://www.openmath.org/cdindex.html

it would be interesting to come up with a reasonable list of math languages

Hans

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