home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!munnari.oz.au!manuel.anu.edu.au!dubhe.anu.edu.au!nunki.anu.edu.au!not-for-mail
- From: jmr@cs.anu.edu.au (Mike Robson)
- Newsgroups: comp.theory
- Subject: P=NP??? $50,000
- Date: 16 Dec 1992 10:18:57 +1100
- Organization: Computer Science Department, ANU, Australia
- Lines: 68
- Distribution: inet
- Message-ID: <1glp51INN1gg@nunki.anu.edu.au>
- NNTP-Posting-Host: nunki.anu.edu.au
- Summary: The proof is clearly wrong
- Keywords: Money
-
-
-
- >Newsgroups: comp.theory
- >Path: gene.fwi.uva.nl!fwi.uva.nl!sun4nl!mcsun!uunet!zaphod.mps.ohio-state.edu!uwm.edu!cs.utexas.edu!torn!watserv2.uwaterloo.ca!watserv1!phonon.uwaterloo.ca!nrswart
- >From: nrswart@phonon.uwaterloo.ca (Nicholas R. Swart)
- >Subject: S. Gismondi and E.R. Swart's research reports.....
- >Message-ID: <ByJIsL.B4y@watserv1.uwaterloo.ca>
- >Sender: news@watserv1.uwaterloo.ca
- >Organization: University of Waterloo
- >Date: Mon, 30 Nov 1992 17:48:20 GMT
- >Lines: 20
-
- [a few lines omitted]
-
- >So far things are looking very good. In an earlier post someone said they
- >would put $10,000 down that the proof is correct. I'll raise that to
- >$50,000.
- >
- >Nicholas Swart
- >Dept. of Elec. and Comp. Engineering
- >University of Waterloo
- >Waterloo, Ontario
- >CANADA
- >N2L 3G1
- >
- >
-
- If this offer has not been withdrawn yet, I hereby accept.
-
- The ways in which the proof is incorrect are at least three. Of course
- only one step needs to be incorrect for the whole proof to be incorrect.
-
- 1. The isomorphism paper relies on a claim that "Every solution to formulation
- F3 can be represented by an expression of the form"
- t = \sum \alpha _i q_i;
- no proof of this claim is made and the authors do not know a proof.
-
- 2. The main theorem of the isomorphism paper is not merely unproven
- but invalid. I have already posted a counterexample to comp.theory.
-
- 3. The "N=1" paper's claim for solution of NP-Complete problems would
- not follow even if the theorem of the isomorphism paper were correct.
- In detail corollary 1 of the isomorphism paper (which would be valid
- if the theorem were valid) relies on the fact that if Ta=b and T has nonzero
- entries wherever Q does (and T has no negative entries), Qa has nonzero
- entries which are a subset of the nonzero entries of Ta (i.e. of b)
- and so, since Qa has the same number of nonzero entries as b, it follows that
- Qa=b.
- In the claimed proofs of linear programming formulations of NP-Complete
- problems in the "N=1" paper, there is no such argument possible, since
- we have merely a condition that Ta= some matrix with specified values
- in a subset of its entries; this is not sufficient to prove Qa= another
- such matrix.
-
- Deficiency 1 in the proof can perhaps be fixed (I believe the assertion
- is probably valid but I can't prove it). Deficiency 3 can possibly be
- overcome by a completely new argument (I doubt it). Deficiency 2 is fatal.
- I do not know that the algorithm is incorrect but the proof definitely is.
-
-
- You can send the cheque to
-
- Dr J. M. Robson,
- Department of Computer Science,
- Australian National University,
- GPO Box 4,
- Canberra, ACT 2601,
- Australia.
-