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> PPS: I still dream of a PL where the sign for defining a symbol and the sign
> for redefining one would not so strangely be the same (and so strangely be
> '='!).

LaTeX does that.

\newcommand gives an error when the command already exists.
You must use \renewcommand then.

It's a PITA most of the time, actually.

Dirk