Re: Clean Object Class Design -- Circle/Ellipse

On Thu, 18 Oct 2001 19:56:16 -0400, "Bob Badour" <bbadour_at_golden.net> wrote:

>>> The interesting question is whether or not he is irrelevant.
>>
>> Was anyone able to articulate any benefits of the subtype==subset
>>definition in the context of programming language theory,
>>rather than database theory?
>
>Why should anybody? You are the only one claiming that anyone has equated
>them.

I already gave you quotes from Date's article, in which he claims that circles must be elipses because that's the real world (like that's a real argument), and that the axiomatization/specification of operations on circles and elipses does not change the relationship of Circle being subtype of Elipse.

Marc Gluch
Mindtap Inc. Received on Sat Aug 18 2001 - 21:16:57 CDT