On 9/1/2017 1:56 PM, Mikael P. Sundqvist wrote:
Hi,

I stumbled upon this (see the attached file for the result):

%%% Test file
\setupbodyfont[10pt]
\starttext
\startTEXpage[offset=10pt]
\type{\tbinom{n}{k}}: $\tbinom{n}{k}$, (does not look good, the vertical space between $n$ and $k$ is too big) \par
\type{\binom{n}{k}}: $\binom{n}{k}$ (looks fine to me)\par
\type{\dbinom{n}{k}}: $\dbinom{n}{k}$ (does not look good, too big parenthesis, even for displayed formulas).\par
\stopTEXpage
\stoptext
%%% End of test file

I think something should be changed to get the binomial coefficients to look better. In particular I am concerned about the rather big parenthesis in displaystyle (and not so much about the vertical space issue in \tbinom).

/Mikael

PS The result looked better if I used the lucida fonts, if that helps.
This is indeed font dependent. These binoms use a low level tex primitive that uses a threshold for steps and that one is part of the math parameters of a font and these are not that good for lm. As I'm looking into some other low level side effect I was in the mood for a configuration option for \setupmathfractions.

So, in the next beta you can get the effects iof the attached:

- relate the threshold to the bodyfont size
- use normal left/right fences instead

fwiw, cambria and pagella look better too. Upto you to wikify it.

Hans

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Attachment: math-binom.pdf
Description: Adobe PDF document

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