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-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,c42dbf68f5320193 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2002-05-07 03:39:21 PST Path: archiver1.google.com!postnews1.google.com!not-for-mail From: dewar@gnat.com (Robert Dewar) Newsgroups: comp.lang.ada Subject: Re: Generation of permutations Date: 7 May 2002 03:39:21 -0700 Organization: http://groups.google.com/ Message-ID: <5ee5b646.0205070239.77c6bac2@posting.google.com> References: <3CD71F4D.C29A60FC@san.rr.com> NNTP-Posting-Host: 205.232.38.244 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: posting.google.com 1020767961 3930 127.0.0.1 (7 May 2002 10:39:21 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: 7 May 2002 10:39:21 GMT Xref: archiver1.google.com comp.lang.ada:23624 Date: 2002-05-07T10:39:21+00:00 List-Id: tmoran@acm.org wrote in message news:... > > If you don't recognise "a given set of machine instructions" as meaning > > any arbitrary set of programs ... > Perhaps such newsgroup posts should follow Knuth's problem sets and > start with a difficulty/requires higher mathematics/non-English phrase > meanings indicator. Or perhaps the "From:" line does the job. Really this is not "higher mathematics", but it is the sort of thing you learn in a course about formal computation (Turing machines etc). The phrase "recursively undecidable" should be a tip off that we are in that realm :-)