Missing a couple redefinitions (math section, paragraph)

[wspr]

From Bruno:

The math section and paragraph signs are missing from the Unicode redefinitions in unicode-math's unicode-math-table.tex. Instead, the definitions from fontmath.ltx are used assigning them to "78 and "7B, respectively, hence yielding "x" and "{".

I spent quite some time trying to use \UnicodeMathSymbol as in unicode-math-table.tex to add the missing definitions, then switching to all the possible variants of the solutions suggested at

http://tex.stackexchange.com/questions/161871/how-to-change-the-mathematical-symbol-class-of-a-unicode-math-symbol https://tug.org/pipermail/xetex/2009-June/013464.html

with no luck. I have the impression unicode-math-table.tex is a database read once and for all while processing \setmathfont, and that later additions using \UnicodeMathSymbol are simply not possible. (Indeed, editing unicode-math-table.tex to add the missing definitions works, but this is not a solution I was willing to consider.)

So after reading one more time the unicode-math doc, I tried out of desperation

\DeclareMathSymbol{\mathsection}{\mathord}{symbols}{"00A7} \DeclareMathSymbol{\mathparagraph}{\mathord}{symbols}{"00B6}

and this did work! It feels a bit odd to specify a math alphabet (symbols) in the redefinition, as I thought unicode-math made this notion obsolete, but I imagine this is the way Unicode is made to fit within LaTeX's math design.

[khaledhosny]

371 talks additionally lists missing \surd as well.