home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!cis.ohio-state.edu!magnus.acs.ohio-state.edu!slc3.ins.cwru.edu!agate!math.berkeley.edu!solovay
- From: solovay@math.berkeley.edu (Robert M. Solovay)
- Newsgroups: sci.logic
- Subject: Re: Non-standard integers.
- Date: 18 Aug 1992 18:55:19 GMT
- Organization: U.C. Berkeley Math. Department.
- Lines: 23
- Distribution: world
- Message-ID: <16rh2nINN6og@agate.berkeley.edu>
- References: <1992Aug17.141017.373@csc.canterbury.ac.nz> <16npkvINNjlq@agate.berkeley.edu> <1992Aug18.133344.385@csc.canterbury.ac.nz>
- NNTP-Posting-Host: math.berkeley.edu
- Summary: Kemeny's conjecture is wrong.
-
- In article <1992Aug18.133344.385@csc.canterbury.ac.nz> wft@math.canterbury.ac.nz (Bill Taylor) writes:
-
- >
- >Thus, the n-tuple-primes conjectures of Hardy would all be false. The only
- >problem with this whole operation is showing that there can be a model with
- >*all* the "rows" having such an `n' in them. Kemeny reluctantly left this
- >loop-hole unplugged.
- >
-
- >--------------------------------------------------------------------------
- > Bill Taylor wft@math.canterbury.ac.nz
- >--------------------------------------------------------------------------
-
- Kemeny's conjecture is false: If M is a non-standard model of
- PA, then there is a non-standard integer n such that no integer in the
- "standard row" of n is divisible by all standard integers.
-
- To see this, take n which is odd but is divisible by all
- standard odd integers. If m differs from n by a standard integer, then
- there must be a standard odd prime which does not divide the
- difference. Hence m is not divisible by that prime.
-
-
-