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Re: Can sets have order?

Subject: Re: Can sets have order?
From: Elliotte Rusty Harold <elharo@xxxxxxxxxxxxxxx>
Date: Thu, 25 Jan 2001 10:20:48 -0500
Re:  Can sets have order?
 I'd also agree with my original statement. Terminology isn't always
 consistently applied.

Agreed here, but I can't think of a respectable terminology that restricts sets to be unordered.


I don't know if he's correct or not, but the eminently respectable C. J. Date writes on p. 92 of the sixth edition of his well respected text "Introduction to Database Systems":


"2. Tuples are unordered (top to bottom)

This property follows from the fact that the body of the relation is a mathematical set; sets in mathematics are not ordered."

This is a rather significant point in his discussion.
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