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Re: Can sets have order?
- To: xsl-list at lists dot mulberrytech dot com
- Subject: Re: [xsl] Can sets have order?
- From: Elliotte Rusty Harold <elharo at metalab dot unc dot edu>
- Date: Thu, 25 Jan 2001 10:20:48 -0500
- References: <200101251449.HAA23528@localhost.localdomain>
- Reply-To: xsl-list at lists dot mulberrytech dot com
>> 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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| Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
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| The XML Bible (IDG Books, 1999) |
| http://metalab.unc.edu/xml/books/bible/ |
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