From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: 103376,9dfc10efb95ba130 X-Google-NewGroupId: yes X-Google-Attributes: gida07f3367d7,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news2.google.com!npeer01.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!nx01.iad01.newshosting.com!newshosting.com!198.186.194.249.MISMATCH!transit3.readnews.com!news-xxxfer.readnews.com!news-out.readnews.com!postnews3.readnews.com!not-for-mail Date: Sat, 11 Sep 2010 14:29:06 -0400 From: "Peter C. Chapin" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.9) Gecko/20100825 Lightning/1.0b2 Thunderbird/3.1.3 MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: Inefficient algorithms References: <1f6f73cd-f5ff-4408-a1d7-c9ca7dfa70ee@m35g2000prn.googlegroups.com> <8f0nd6F8ucU1@mid.individual.net> <8f0o4uFct8U1@mid.individual.net> <87lj78ab6m.fsf@ludovic-brenta.org> <8f16vaF2q1U1@mid.individual.net> In-Reply-To: <8f16vaF2q1U1@mid.individual.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Message-ID: <4c8bcae9$0$2400$4d3efbfe@news.sover.net> Organization: SoVerNet (sover.net) NNTP-Posting-Host: 25d93ffb.news.sover.net X-Trace: DXC=g[0?Fl3aB9ORZfJoa3=8@NK6_LM2JZB_CYHO@RciHi`C:WUUlR<856O\_cDWn30VlHG;Q:jlUQ]YE X-Complaints-To: abuse@sover.net Xref: g2news1.google.com comp.lang.ada:14016 Date: 2010-09-11T14:29:06-04:00 List-Id: On 2010-09-11 07:20, Niklas Holsti wrote: > This example is just the Boolean satisfiability problem (SAT), a > well-known difficult problem, which is not trivial in the general case. Indeed, SAT is NP-complete. I believe it may have been the first problem proved to be NP-complete (not sure). So if P /= NP as many people suspect, there is no polynomial time way of solving SAT. Peter