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

[Philip Taylor (Hellenic Institute)]

On 28/04/2023 11:34, Ulrike Fischer wrote:
> Well your code doesn't work with pdftex (or xelatex) neither. 
Why would you expect it to work with Xe/*La*/TeX ?  This was a question 
about */plain/* tex.  It works here using XeTeX, the only TeX engine 
that I ever use, and of course I tested it before posting, otherwise I 
would have appended an appropriate disclaimer.  Repeated below, but not 
in monospace in case that is the cause of your problem.
> You introduced U+A0 (no break spaces) after some of the fontnames,
> and now TeX is looking e.g. for cmr7U+A0 and is a bit unhappy.

I didn't /introduce/ them, they came from the PDF version of the TeXbook 
from which I copied the relevant parts of Plain.TeX.  But as I say, it 
works here under XeTeX, so I don't really know what your problem is or 
where it originates — maybe your e-mail client ?

> $\forall x \in X, \quad \exists y \leq \epsilon$
>
> $$\forall x \in X, \quad \exists y \leq \epsilon$$
>
>
> \font\tenrm=cmr10 scaled \magstep 2
>
> \font\sevenrm=cmr7 scaled \magstep 2
>
> \font\fiverm=cmr5 scaled \magstep 2
>
> \font\teni=cmmi10 scaled \magstep 2
>
> \font\seveni=cmmi7 scaled \magstep 2
>
> \font\fivei=cmmi5 scaled \magstep 2
>
> \font\tensy=cmsy10 scaled \magstep 2
>
> \font\sevensy=cmsy7 scaled \magstep 2
>
> \font\fivesy=cmsy5 scaled \magstep 2
>
> \font\tenex=cmex10 scaled \magstep 2
>
> \font\tenbf=cmbx10 scaled \magstep 2
>
> \font\sevenbf=cmbx7 scaled \magstep 2
>
> \font\fivebf=cmbx5 scaled \magstep 2
>
> \font\tensl=cmsl10 scaled \magstep 2
>
> \font\tentt=cmtt10 scaled \magstep 2
>
> \font\tenit=cmti10 scaled \magstep 2
>
>
> \textfont1=\teni \scriptfont1=\seveni \scriptscriptfont1=\fivei
>
> \textfont2=\tensy \scriptfont2=\sevensy \scriptscriptfont2=\fivesy
>
> \textfont3=\tenex \scriptfont3=\tenex \scriptscriptfont3=\tenex
>
>
> $\forall x \in X, \quad \exists y \leq \epsilon$
>
> $$\forall x \in X, \quad \exists y \leq \epsilon$$
>
> \end
>

-- 
/Philip Taylor/

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