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Re: technical question

>Would it be possible, using the existant macro in plain to produce an
>estensible integral sign ?

No, since the current macro:

   \mathchardef\intop="1352 \def\int{\intop\nolimits}

produces a mathop rather than a <delim>, so you can't use \left and
\right around it.  To produce a big integral, you need:

   \mathchardef\intdelim="4352

used by:
\[
   \left\intdelim ... \right.
\]
Of course, the script positioning for this might not be what you want,
since \intdelim is a delimiter, but never mind...

Alan.