Re: a union is always a join!

From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 09 Mar 2009 00:35:10 GMT
Message-ID: <2vZsl.15964$Db2.11427_at_edtnps83>

paul c wrote:
...

> ... It's true that materializing some
> negations is intractable. ...

ie., their extensions Received on Mon Mar 09 2009 - 01:35:10 CET

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