Re: [NTG-context] Monospace fallback kerning

[Hans Åberg]

> On 19 Dec 2018, at 18:25, Hans Hagen <j.ha...@xs4all.nl> wrote:
> 
> On 12/19/2018 3:48 PM, Hans Åberg wrote:
> 
>> An incidental remark: TeX puts simultaneous sub- and superscripts above each 
>> other, and the Unicode sub- and superscripts are translated as such in the 
>> example below math mode. But actually, there may be a semantic difference  
>> between the order (though not in the case below), and that is used in tensor 
>> notation. In TeX, the original suggestion is to use {} in such a case.
>> —
>> \definefontfallback
>>  [Mono] [stixtwotext]
>>  [range={0100-10FFFF},factor=1] [force=yes]
>> \setupbodyfont
>>  [dejavu,10pt]
>> \showglyphs
>> \starttyping
>>   𝑷₂₀(0), ∀²𝑥⁰⁺²₂₀: 𝑷₂₀(𝑥⁰⁺²₂₀) ⇒ 𝑷₂₀(s(𝑥⁰⁺²₂₀)) ⊢ ∀¹𝑦⁰⁺¹₂₀ 𝑷₂₀(𝑦⁰⁺¹₂₀)
>> \stoptyping
>> \startformula
>>   𝑷₂₀(0), ∀²𝑥⁰⁺²₂₀: 𝑷₂₀(𝑥⁰⁺²₂₀) ⇒ 𝑷₂₀(s(𝑥⁰⁺²₂₀)) ⊢ ∀¹𝑦⁰⁺¹₂₀ 𝑷₂₀(𝑦⁰⁺¹₂₀)
>> \stopformula
> ah, so it's time for some new (undocumented) math magic .. the next beta will 
> have this:
> 
> \startformula
>  𝑷₂₀(0), ∀²𝑥⁰⁺²₂₀: 𝑷₂₀(𝑥⁰⁺²₂₀) ⇒ 𝑷₂₀(s(𝑥⁰⁺²₂₀)) ⊢ ∀¹𝑦⁰⁺¹₂₀ 𝑷₂₀(𝑦⁰⁺¹₂₀)
> \stopformula
> 
> \startformula
>  \unstackscripts 𝑷₂₀(0), ∀²𝑥⁰⁺²₂₀: 𝑷₂₀(𝑥⁰⁺²₂₀) ⇒ 𝑷₂₀(s(𝑥⁰⁺²₂₀)) ⊢ ∀¹𝑦⁰⁺¹₂₀ 
> 𝑷₂₀(𝑦⁰⁺¹₂₀)
> \stopformula

That might be useful for those depending on it, and presumably there is a 
\stackscripts, too. Just comes to my mind:

Though probably non-standard in typesetting, one might make a slight 
typographic difference between 𝑥²₀ and 𝑥₀² by letting the sub- or superscripts 
that come later partially, but not fully, to the position of the one that comes 
before. For example, 𝑥₀² might mean the square of 𝑥₀, and 𝑥²₀ the component 0 
of 𝑥², not necessarily the same. Traditionally, such things are left for the 
reader to interpret.


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