Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!nsc!andrew From: andrew@nsc.nsc.com (andrew) Newsgroups: comp.ai.neural-nets Subject: Re: Prove non-existence with neural net? Summary: non-existence of course impossible Keywords: Cray, finite projective plane, confusion Message-ID: <9905@nsc.nsc.com> Date: 18 Feb 89 04:52:03 GMT References: <1637@cps3xx.UUCP> <1233@usfvax2.EDU> <476@madnix.UUCP> <44911@linus.UUCP> Organization: National Semiconductor, Santa Clara Lines: 22 Hmmmm. Re-phrase your title: "prove non-existence with neural net?" to "prove existence after termination with neural net" and all becomes clear. Perhaps Sean is being unduly pessimistic. Perhaps Sean realises that if an FPP can be found - e.g. by a neural net - that is of an order formally excluded by conjecture - then that conjecture is disproved. The nice thing thing about the net idea is how it scales with order. Order **6 is much nicer than (NcK)**N, but of course this is, as he point out, apples with non-exhaustive pears. "Exactly" is quite easy - just look at the NN settled state, and count 1's for a few seconds. This is eyeball and brain territory, and no big deal. For lack of decent simulation x-ware, I'm unable to say what happens with order 6. Andrew Palfreyman, MS D3969 PHONE: 408-721-4788 work National Semiconductor 408-247-0145 home 2900 Semiconductor Dr. there's many a slip P.O. Box 58090 'twixt cup and lip Santa Clara, CA 95052-8090 DOMAIN: andrew@logic.sc.nsc.com ARPA: nsc!logic!andrew@sun.com USENET: ...{amdahl,decwrl,hplabs,pyramid,sun}!nsc!logic!andrew