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

To: "[ontolog-forum] " <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Christopher Menzel <cmenzel@xxxxxxxx>
Date: Thu, 4 Feb 2010 09:19:10 -0600
Message-id: <76DFF4DF-CEF1-4085-A52F-792A4659BBA6@xxxxxxxx>
On Feb 4, 2010, at 8:04 AM, John F. Sowa wrote:
> But Chris M. used the example of set theory, all versions of which
> have the same two "primitives" -- subsetOf and elementOf.      (01)

elementOf, i.e., ∈, is the only primitive you need (and the only one you'll 
find in most modern texts):    (02)

  A ⊆ B =def ∀x(x∈A → x∈B)    (03)

-chris    (04)

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