[lltx] $n\choose k$-issue with OpenType math fonts
ulrik.vieth at arcor.de
Sat Mar 5 20:57:06 CET 2011
On 03/05/2011 03:58 PM, Philipp Stephani wrote:
> There surely exists a reason why Microsoft chose to leave out the three
> parameters delim1, delim2, and sub2.
>Perhaps they thought that distinguishing between \left(1 \atop 2\right)
> and 1 \atopwithdelims() 2 would be too surprising and seldom relevant.
> I think better than guessing correct parameter values would be
> to do the equivalent of \left(1 \atop 2\right) if the user requested
> 1 \atopwithdelims() 2 and the parameters are undefined.
I already discussed this issue in my paper "OpenType Math illuminated"
http://www.tug.org/TUGboat/tb30-1/tb94vieth.pdf on p.28.
I essentially came to the same conclusions:
"In the absence of a better solution, it may be
best to simply avoid using \atopwithdelims with
OpenType math fonts in the new TEX engines and
to redefine user-level macros (such as \choose)
in terms of \left and \right delimiters."
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