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

[Philip Taylor (Hellenic Institute)]

On 28/04/2023 07:47, Steve Litt wrote:
> How do I make fonts bigger in **plain tex** math mode?

Re-define the fonts and font families used in maths mode —

$\forall x \in X, \quad \exists y \leq \epsilon$
$$\forall x \in X, \quad \exists y \leq \epsilon$$

\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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