Re: By The Dawn's Normal Light

From: Marshall Spight <mspight_at_dnai.com>
Date: Sat, 23 Oct 2004 15:23:50 GMT
Message-ID: <aIued.412977$mD.116427_at_attbi_s02>


"Laconic2" <laconic2_at_comcast.net> wrote in message news:v7KdnTYJA9OV2uTcRVn-hg_at_comcast.com...
>
> If a student is enrolled in these courses: {'CS101', 'PSYCH101', 'ENG101',
> 'MATH101'} the student has the same SET of courses as the criterion. But
> does not have the same LIST of courses as the criterion. Thus the
> distinction between a SET and a LIST is critical to the type engine. IMO,
> of course.

Sets:

unordered
duplicates are not allowed
members identified by content

Lists:

ordered
duplicates allowed
member identified by position

They are signficantly different. Note also there are totally ordered sets and partially ordered sets, and that neither of these are lists, either.

Marshall Received on Sat Oct 23 2004 - 17:23:50 CEST

Original text of this message