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From: Erwin <e.smout@myonline.be>
Newsgroups: comp.databases.theory
Subject: Re: <OR> predicate?
Date: Wed, 29 Sep 2010 06:33:05 -0700 (PDT)
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On 28 sep, 18:52, Vadim Tropashko <vadim...@gmail.com> wrote:

> I'm not sure I follow their idea that SUMMARIZE is expressed via AND,
> OR, NOT, REMOVE, RENAME. Emailed to Hugh once, but didn't get a
> responce
>
> - Tekst uit oorspronkelijk bericht weergeven -

Why not ?

It has not been sufficiently demonstrated that SUMMARIZE can be
expressed in terms of the 'classical' primitives JOIN,PROJECT,EXTEND ?

It has not been sufficiently demonstrated that those 'classical'
primitives can be expressed using the A operators ?