Fwd: Re: The binomial coefficients do not look optimal

* Fwd: Re: The binomial coefficients do not look optimal
       [not found] <d4eb754b-9b68-2801-4bfe-378195d1af0d@wxs.nl>
@ 2017-09-02 16:36 ` Hans Hagen
  2017-09-05 18:21   ` Mikael P. Sundqvist
  0 siblings, 1 reply; 2+ messages in thread
From: Hans Hagen @ 2017-09-02 16:36 UTC (permalink / raw)
  To: mailing list for ConTeXt users


-------- Forwarded Message --------
Subject: Re: [NTG-context] The binomial coefficients do not look optimal
Date: Sat, 2 Sep 2017 18:35:53 +0200
From: Hans Hagen <pragma@wxs.nl>
To: Mikael P. Sundqvist <mickep@gmail.com>

On 9/2/2017 4:58 PM, Mikael P. Sundqvist wrote:
> On Fri, Sep 1, 2017 at 7:49 PM, Hans Hagen <pragma@wxs.nl 
> <mailto:pragma@wxs.nl>> wrote:
> 
>     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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> 
> Thank you very much, I'm looking forward to the next beta, and I will 
> try to wikify it when I have tried it out. Also lucida looks better than 
> latin modern does at the moment.
> 
> I am a bit confused about the different versions. I would have guessed 
> that there was \tbinom and \dbinom and that \binom used one of them 
> depending on if one is in text mode or in display mode (just as I would 
> expect \frac to behave like \tfrac in text mode and \dfrac in display 
> mode). But \tbinom looks very different from \binom in text mode (with 
> more vertical space).  Is this on purpose? Have I missed something?
One can configure those things but the absense of rules and presence of 
fences matters too (all kind of inter-this-or-that and 
above-below-this-or-that playts a role).

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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