Instead of \triangle you "should" use \Delta for the laplacian (as you
should use \nabla for the gradient).
Mikael
On Fri, Apr 11, 2014 at 6:06 AM, Sanjoy Mahajan <san...@mit.edu> wrote:
>> I cannot say whether the wrong placement is due to the wrong font
>> metrics or the wrong mapping (mathop vs mathord) by ConTeXt.
>
> I tried '\triangle T' (often used as the Laplacian operator, instead of
> writing it out as \nabla^2). That one comes out fine, even though
> \triangledown does not. But they seem to have similar kinds of
> defintions/mappings:
>
> From luatex-math.tex :
>
> \def\triangle {\Umathchar "0"0"0025B3 }
> \def\triangledown {\Umathchar "2"0"0025BD }
>
> So it must be a wrong font metric?
>
> -Sanjoy
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