x*x-1=0

From: <vadimtro_at_yahoo.com>
Date: Thu, 18 Jan 2001 23:12:25 GMT
Message-ID: <947t8g$3as$1@nnrp1.deja.com>

What the closest analog of
x^2-1=0
in relational algebra would be? Does
A MULTIPLY B MULTIPLY C
have any resemblance to power 2? Then,
even though MULTIPLY, UNION/DIFFERENCE, TABLE_DEE and TABLE_DUM seem to be right candidatures, the other primitive operators -- RESTRICT, and PROJECT -- would be left out of the equation.

You probably figured out already, that my bottom line question is if anything like algebraic varieties/ideals theory exists for Relational Algebra.

Appreciate your input
Vadim

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