Using non-sans bold math

[legendre6891]

Hi OpTeX users,

I am having trouble using non-sans bold math. My document is

\_protected\_def\_mabf {\_inmath{\_bfvariables\_bfgreek\_bfGreek\_bfdigits}}

$\bf A$

\bye

(I copied the first line from the PDF manual.)

When I run this through OpTeX, I am getting the error

This is LuaTeX, Version 1.15.0 (TeX Live 2022)
 restricted system commands enabled.
(./luenberger-exercises.tex
This is OpTeX (Olsak's Plain TeX), version <1.13 Nov 2023>
! Undefined control sequence.
\_mabf ->\_inmath
                  {\_bfvariables \_bfgreek \_bfGreek \_bfdigits }
l.3 $\bf
       A$

Could someone give me a pointer? Much thanks

[legendre6891]

It seems like the problem is that the \_inmath macro is defined in unimath-codes.opm. Therefore, we need to load unicode font to make \_inmath available.

For example, this works:

\fontfam[LMfonts]

\_protected\_def\_mabf {\_inmath{\_bfvariables\_bfgreek\_bfGreek\_bfdigits}}

$\bf A$

\bye

I'm curious if it's possible to do this without using \fontfam[LMfonts]?

[olsak]

Moving the definition of \_inmath from unimath-codes to the OpTeX core isn't sufficient, when you are using the example

\_protected\_def\_mabf {\_inmath{\_bfvariables\_bfgreek\_bfGreek\_bfdigits}}

This example is intended only for Unicode math, because the macros \_bfvariables, \_bfgreek, \_bfGreek, \_bfdigits are defined only when Unicode math is loaded.

The non-Unicode math is pre-loaded in OpTeX only for testing purposes (for example for testing simple macros or for comparing non-Unicode math with Unicode math. The serious work needs Unicode math, IMHO.

If you insist on non-Unicode math in your document and you need original plain TeX \bf, then you have to do somewhat different work, because Unicode math macros and non-Unicode math macros are very different:

\_addto\_normalmath{\_loadmathfamily 8 cmbx }
\_normalmath

$\bf A$

\bye

The question remains: what to do with OpTeX so that other users don't have a problem with it. Maybe, this answer in this discussion is sufficient. Or I can add something into the documentation about this (but I don;t prefer it). The question+answer on this issue in tex.stackexchange should be good compromise, because such an answer is good searchable in the internet.

[legendre6891]

Thank you Petr; I read the documentation more thoroughly and understand/agree now that "serious work needs Unicode math, IMHO. Agree the current situation is sufficient.