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Re: [ontolog-forum] Foundation ontology, CYC, and Mapping

To: "doug@xxxxxxxxxx" <doug@xxxxxxxxxx>, "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Duane Nickull <dnickull@xxxxxxxxx>
Date: Wed, 3 Feb 2010 22:37:22 -0800
Message-id: <C78FAB22.AEB8%dnickull@xxxxxxxxx>

Can you please clarify what you mean by “Sets are timeless; they cannot change their members”. Do you mean they cannot add new members?  Can they not change enumeration lists of existing members?  Can existing members values be retracted?


On 2/3/10 5:47 PM, "doug  foxvog" <doug@xxxxxxxxxx> wrote:

The definition should start out that a set has members.  Restrictions
on the permissible types of members can identify different types of set,
or in given contexts may limit what is considered to be a generic set.
Sets are timeless; they cannot change members.  If an element which is not
in a set is added to a set, the result is a different set.

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