Re: \triangledown placed too low in Palatino

[Aditya Mahajan <adityam@umich.edu>]

On Thu, 10 Apr 2014, Sanjoy Mahajan wrote:

> Jannik,
>
> You are right.  \nabla looks much nicer and is placed correctly.  (I
> still think the \triangledown placement is slightly off.)
>
> My environment files from MkII days have \def\nabla{\triangledown}, so I
> never tried the true \nabla until your suggestion.

In MkIV: \triangledown is mapped to 0x25BD while nabla is mapped to 
0x2207. These are different glyphs.

IIUC, the difference in placement is because \triangledown is defined as a 
mathop (and hence centered on the math-axis) while \nabla is defined as a 
mathord. Compare:

\startformula
   \nabla T
   \quad
   \triangledown T
   \quad
   \mathop{\nabla} T
\stopformula

From what I remember, I was the one who added the mappings for 
triangledown as a mathop based on, I believe, unicode-math package in 
LaTeX. I don't understand what all the "triangle operators" are supposed 
to do. As such, I cannot say whether the wrong placement is due to the 
wrong font metrics or the wrong mapping (mathop vs mathord) by ConTeXt.

Aditya
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