Clive D.W. Feather
clive at demon.net
Mon Dec 17 04:17:00 PST 2001
Charles Lindsey said:
> We certainly discussed this. Essentially, "U,!V" means "start with the
> universe U, and then eliminate from it everything in V". If the wildmat
> starts with a '!', then there is no initial universe.
> But why not take '*' as the initial universe, you ask? Good question! All
> I remember is that we disallowed that for some reason. Perhaps Clive will
Because it's equally arbitrary. We have to pick between two arbitrary
(1) Wildmats must not begin with "!".
(2) If a wildmat begins with "!", it is treated as if "*," was prefixed.
Number 1 appeared safer; note that if you want "*,!V", nothing is stopping
you writing "*,!V".
Clive D.W. Feather | Work: <clive at demon.net> | Tel: +44 20 8371 1138
Internet Expert | Home: <clive at davros.org> | Fax: +44 20 8371 4037
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Thus plc | |
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