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Re: Thinking about MINUS

From: DBMS_Plumber <paul_geoffrey_brown_at_yahoo.com>
Date: 8 Jan 2007 09:49:13 -0800
Message-ID: <1168278552.531567.114870@11g2000cwr.googlegroups.com> 






Marshall wrote:


> Even if we consider a system consisting only of the natural numbers,

> zero, successor and predecessor, we have to wrestle with the question

> of what the predecessor of zero is.




Zero is not an element of the domain of natural numbers.
Received on Mon Jan 08 2007 - 11:49:13 CST












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