Inserting \mathcal in octave documentation

[Federico Zenith]

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Hi all,
As some may remember I set out to fix some things in Octave's documentation. I 
found out that \mathcal is not accepted in plain TeX. I need that to write 
properly (i.e. the way I like ;-) H-2 and H-infinity; in LaTeX, I use: 
$\mathcal{H}_\infty$ and $\mathcal{H}_2$.
Does anybody know how to insert this character into TeX (in the flavor used by 
octave documentation)? I guess I would have problems with other characters as 
\infty, how do I insert them?

Cheers,
- -Federico
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