home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky sci.math:17462 sci.philosophy.tech:4624
- Newsgroups: sci.math,sci.philosophy.tech
- Path: sparky!uunet!pmafire!mica.inel.gov!guinness!opal.idbsu.edu!holmes
- From: holmes@opal.idbsu.edu (Randall Holmes)
- Subject: Re: Numbers and sets
- Message-ID: <1992Dec28.165203.402@guinness.idbsu.edu>
- Sender: usenet@guinness.idbsu.edu (Usenet News mail)
- Nntp-Posting-Host: opal
- Organization: Boise State University
- References: <Bzosz1.FMx@cantua.canterbury.ac.nz> <1992Dec23.175145.18528@guinness.idbsu.edu> <1992Dec27.035413.18857@husc3.harvard.edu>
- Date: Mon, 28 Dec 1992 16:52:03 GMT
- Lines: 29
-
- I'm avoiding nested quotations here.
-
- On "purports to mean"; that was a slip of the metaphorical tongue.
- Zeleny certainly did succeed in meaning what he said.
-
- Certainly Foundation asserts that a _nonempty_ set is disjoint from
- one of its elements :-( Sorry about that.
-
- My profession is relevant; Zeleny is claiming that the _definition_ of
- a concept within the sphere of my work implies certain things. Zeleny
- undermines his own position by pointing out an alternate approach to
- the notion of "set", that which regards sets as extensions of
- predicates. Obviously, I regard stratified comprehension (the
- comprehension axiom of NF or NFU) as an acceptable version of the
- latter approach; the mere existence of the alternate approach casts
- doubt on the claim that Foundation is an analytic property of sets.
-
- It is quite true that if one regards "set" as being defined in terms
- of the iterative hierarchy, Foundation becomes analytic. Well-founded
- sets are well-founded for the same sort of reason that bachelors are
- unmarried. But Choice remains open to doubt (I don't doubt it,
- myself, but I don't regard it as analytically true of sets, either).
-
-
- --
- The opinions expressed | --Sincerely,
- above are not the "official" | M. Randall Holmes
- opinions of any person | Math. Dept., Boise State Univ.
- or institution. | holmes@opal.idbsu.edu
-