Re: Interpretation of Relations

From: Marshall <marshall.spight_at_gmail.com>
Date: 20 Jan 2007 06:53:04 -0800
Message-ID: <1169304784.368406.150520@a75g2000cwd.googlegroups.com>

On Jan 20, 6:17 am, Bob Badour <bbad..._at_pei.sympatico.ca> wrote:

> Exactly! DEE is the relational equivalent of 'True' and is the identity
> element for JOIN while DUM is the relational equivalent of 'False'.

Terminology question:

We use the term "identity" to describe a value id relative to a binary operator op that has the property:

forall x. x op id = x

Is there a term used to describe the value v in the below?

forall x. x op v = v

Ex.: 0 for multiply, false for AND, etc.

Marshall Received on Sat Jan 20 2007 - 08:53:04 CST