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Re: TRUE and FALSE values in the relational lattice

From: Vadim Tropashko <vadimtro_invalid_at_yahoo.com>
Date: Thu, 21 Jun 2007 10:51:06 -0700
Message-ID: <1182448266.868977.167490@e9g2000prf.googlegroups.com>


On Jun 21, 7:12 am, Marshall <marshall.spi..._at_gmail.com> wrote:
> I would be interested to have the axioms for division
> especially.

Here is a cute identity involving set equality join (not division!), and equality relation:

((R /=\ E) /=\ E ) = R

where the "/=\" is a symbol for set equality join. Received on Thu Jun 21 2007 - 12:51:06 CDT

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