Re: [NTG-context] Unicode mathematics in ConTeXt

On Sat, 04 May 2019 04:32:19 -0600, Wolfgang Schuster wrote:

Hi Idris,

please read this: https://www.w3.org/TR/unicode-xml/#Superscripts

Many thanks. The issue is clearer now, e.g., ======= When used in mathematical context (MathML) it is recommended to consistently use style markup for superscripts and subscripts. This is because mathematical layout allows not just individual symbols, but entire expressions to be superscripted or subscripted in a regular, nested manner. ======= Of course, consistent use of style markup means that we can't naively extract superscript text from the pdf, e.g., \CATCA becomes 𝓒nt. OTOH, issues 4.i and 4.ii below are still perplexing. Are there any workarounds? Thanks again. Best wishes Idris

Hamid,Idris schrieb am 03.05.2019 um 21:40:

...

Dear gang,

Ok, I've made some progress:

1. tex-gyre etc. *do* support Unicode mathematics, but the version of ConTeXt I was using had produced the wrong encoding in the pdf output. For example, U+1D4D2 (𝓒) in the input was being mapped to U+2D4D2 in the output.

Updating to the latest beta appears to have fixed this issue.

2. tex-gyre etc. appears to be missing some superscript characters, e.g., ⁿ (U+207F).

3. New example:

======= \setupbodyfont [cambria,12pt] % [pagella,12pt] % [times,12pt]

% \starttext \startTEXpage \def\ANTI{{^{\rm nt}}} \def\ANTIU{{^{\rm ⁿᵗ}}}

\def\CATCA{$\cal \bf C\ANTI$} \def\CATCAU{$𝓒\ANTIU$}

𝓒 \CATCA \CATCAU \stopTEXpage % \stoptext =======

\CATCAU and \ANTIU use Unicode characters and superscripts directly, instead of the old TeX method.

4. Issues. In the pdf output of \CATCAU: i) Why does ConTeXt make the second superscript larger than the first? ii) If one copies the text of the pdf output to an editor - even this email client - the second superscript moves to a new line:

𝓒 ⁿ t

Why does this happen? Is this a bug?

5. Here is what we want: 𝓒 ⁿᵗ

What is the proper or best way to get a character-superscript combination in ConTeXt whose output can be copied and pasted to an editor and give the correct result? What am I missing?

Thank you in advance.

Best wishes Idris

On Wed, 01 May 2019 14:58:06 -0600, Hamid,Idris wrote:

...

Dear gang,

I need to convert a document from TeX-style to Unicode mathematics. For example:

\starttext \def\ANTI{{^{\rm nt}}} \def\CATCA{$\cal \bf C\ANTI$}

\CATCA \stoptext

Issues:

1. I need calligraphic characters, but the relevant characters in latinmodern-math.otf are not encoded in (standard) Unicode. The same goes for the tex-gyre-math fonts.

2. What comprehensive unicode-math fonts do you recommend as an alternative?

3. In the above example, \cal is used.

4. Other issues may arise, e.g., getting subscripts and superscripts correct. How might one rewrite the above with Unicode mathematics in mind? Is there a My Way or some other guide to Unicode mathematics in ConTeXt?

This writer has never had to think about this matter before so this is all new ground to learn. Thank you in advance for any guidance.

Best wishes Idris -- Idris Samawi Hamid, Professor Department of Philosophy Colorado State University Fort Collins, CO 80512