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strange math codes

To:	IN%"math-font-discuss@cogs.susx.ac.uk"

> \mathcode`\ ="8000 % \space
> \mathcode`\'="8000 % ^\prime
> \mathcode`\_="8000 % \_
> I can see the reason for prime, but why the other two?

if i remember ocrrectly the math code is looked at if the catcode of
the corresponding char is 11 or 12. Don's definitions thus allow him
to just write _ in math for \_ by making it catcode 12, same for the
space if the active form has a suitable definition.

nevertheless i don't think it should be in lplain but that is a
different matter.