How to make fonts bigger in **plain tex** math mode?

[Philip Taylor (Hellenic Institute)]

On 28/04/2023 14:18, Ulrike Fischer wrote:
> Am Fri, 28 Apr 2023 11:55:37 +0100 schrieb Philip Taylor (Hellenic
> Institute):
>
>>> Well your code doesn't work with pdftex (or xelatex) neither.
>> Why would you expect it to work with Xe/*La*/TeX ?
> Why don't you recognize a typo? It is so difficult to guess that I
> meant xetex?
Yes.  If you write "xelatex", I assume that you /mean/ XeLaTeX  — since 
you are a member of the LaTeX project team, why should I assume otherwise ?
> As your code errored for Steve too at the U+A0, I would say it is
> more probable that the problem is on your side.

Since the code as posted works here, but does not work in at least two 
other locations, I am inclined to believe that the problem lies not any 
one "side" but rather in the use of e-mail to convey code — this very 
point was made recently by Luigi Scargo :

> On 18/04/2023 08:08, luigi scarso wrote:
>>
>> First of all, thank you all for the past, present and future patches.
>>
>>  I would ask you to send me the attached patches, because copying and 
>> pasting from email text is not robust -- sometimes I, sometimes you  
>> copy badly.
>> A single file with patches is fine.
>>
>> I take as a reference
>> https://gitlab.lisn.upsaclay.fr/texlive/luatex
>> texlive may be a little further behind.
>>
>> --
>> luigi
>
>

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