missing characters

[Udicoudco]

On Mon, May 8, 2023 at 12:11 PM Wolfgang Engelmann
<engelmann at uni-tuebingen.de> wrote:
>
> In my lyx document (Koma script book) under no TeX (via LuaTX) I get
> these errors:
>
> Missing character: There is no 𝜇 (U+1D707) in font
> [LibertinusSerif-Regular.o
> tf]:mode=base;script=latn;language=dflt;+tnum;+lnum;!
> .
> <argument> ...rdinate) and growth rate ($\mathrm {\mu m/sec}$
>                                                    , red, right
> ordinate) of ...
>

Looks like you are using unicode-math and the \mathrm macro.
\mathrm will switch to the text font, which does not contain some
of the mathematical symbols (greek letters in this case). Use \symup
or \symrm instead.

If you want you can pass the option mathrm=sym to unicode math
so that \mathrm will work as \symrm, but that can prevent kerning
in operator names (\sin etc.).

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