From rb@ravenbrook.com Thu May 27 16:41:39 2004 Received: from [127.0.0.1] (crow.ravenbrook.com [193.112.141.129]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id i4RFecjg060586 for ; Thu, 27 May 2004 16:41:39 +0100 (BST) (envelope-from rb@ravenbrook.com) Mime-Version: 1.0 (Apple Message framework v613) Content-Transfer-Encoding: 7bit Message-Id: <584ACC1C-AFF4-11D8-8CC0-000393D3C042@ravenbrook.com> Content-Type: text/plain; charset=US-ASCII; format=flowed To: puzzles@ravenbrook.com From: Richard Brooksby Date: Thu, 27 May 2004 16:41:39 +0100 X-Mailer: Apple Mail (2.613) X-Mailman-Approved-At: Thu, 27 May 2004 16:43:18 +0100 Subject: [puzzles] Test message to puzzles X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 May 2004 15:41:40 -0000 This is a test message to the puzzles mailing list. I'm changing our mailing list server to combat spam problems. I'm just checking that the list is working with the new server. You can follow the links below to find out more. Let me know if you have any problems with the list. From nb@ravenbrook.com Fri Nov 26 11:39:18 2004 Received: from thrush.ravenbrook.com (thrush.ravenbrook.com [193.112.141.145]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id iAQBdIuo022539 for ; Fri, 26 Nov 2004 11:39:18 GMT (envelope-from nb@ravenbrook.com) Received: from thrush.ravenbrook.com (localhost [127.0.0.1]) by thrush.ravenbrook.com (8.12.9p2/8.12.9) with ESMTP id iAQBdIrB010081 for ; Fri, 26 Nov 2004 11:39:18 GMT (envelope-from nb@thrush.ravenbrook.com) From: Nick Barnes To: puzzles@ravenbrook.com Date: Fri, 26 Nov 2004 11:39:18 +0000 Message-ID: <10080.1101469158@thrush.ravenbrook.com> Sender: nb@ravenbrook.com Subject: [puzzles] Friday puzzle: postcodes and grid references X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Nov 2004 11:39:19 -0000 Friends recently moved house. Their new house has an unusual property due to its location: the first four characters of its postcode are the same as the first four characters of its OS grid reference. 1. How many properties have this property? 2. Are there any properties which share the first *five* characters of postcode and grid reference? 3. Unfortunately the formats of postcodes prevent six or seven characters being shared, and postcodes don't have eight characters (AFAIK). However, common codes for representing digits as letters (such as 31332 coding) would theoretically allow full postcode/grid reference sharing (so, e.g. "TS12 3LE" <-> "TS12313"). Do any properties have this property? I have /usr/local/share/misc/uk-postcodes, if it would help in answering these questions. Nick B From nb@ravenbrook.com Thu Mar 24 16:30:02 2005 Received: from thrush.ravenbrook.com (thrush.ravenbrook.com [193.112.141.145]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id j2OGU1uo016007; Thu, 24 Mar 2005 16:30:01 GMT (envelope-from nb@ravenbrook.com) Received: from thrush.ravenbrook.com (localhost [127.0.0.1]) by thrush.ravenbrook.com (8.12.9p2/8.12.9) with ESMTP id j2OGU1rB091988; Thu, 24 Mar 2005 16:30:01 GMT (envelope-from nb@thrush.ravenbrook.com) From: Nick Barnes To: experts@ravenbrook.com Date: Thu, 24 Mar 2005 16:30:01 +0000 Message-ID: <91987.1111681801@thrush.ravenbrook.com> Sender: nb@ravenbrook.com Cc: puzzles@ravenbrook.com Subject: [puzzles] Argh, the grid, the grid X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Mar 2005 16:30:02 -0000 From nb@ravenbrook.com Thu Mar 31 12:18:12 2005 Received: from thrush.ravenbrook.com (thrush.ravenbrook.com [193.112.141.145]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id j2VBIBU7081567; Thu, 31 Mar 2005 12:18:12 +0100 (BST) (envelope-from nb@ravenbrook.com) Received: from thrush.ravenbrook.com (localhost [127.0.0.1]) by thrush.ravenbrook.com (8.12.9p2/8.12.9) with ESMTP id j2VBIBHs004041; Thu, 31 Mar 2005 12:18:11 +0100 (BST) (envelope-from nb@thrush.ravenbrook.com) From: Nick Barnes To: experts@ravenbrook.com Date: Thu, 31 Mar 2005 12:18:11 +0100 Message-ID: <4040.1112267891@thrush.ravenbrook.com> Sender: nb@ravenbrook.com Cc: puzzles@ravenbrook.com Subject: [puzzles] The Language Game X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 31 Mar 2005 11:18:12 -0000 From nb@ravenbrook.com Thu Apr 21 11:41:40 2005 Received: from thrush.ravenbrook.com (thrush.ravenbrook.com [193.112.141.145]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id j3LAfeXj016139 for ; Thu, 21 Apr 2005 11:41:40 +0100 (BST) (envelope-from nb@ravenbrook.com) Received: from thrush.ravenbrook.com (localhost [127.0.0.1]) by thrush.ravenbrook.com (8.12.9p2/8.12.9) with ESMTP id j3LAfeHs096595 for ; Thu, 21 Apr 2005 11:41:40 +0100 (BST) (envelope-from nb@thrush.ravenbrook.com) From: Nick Barnes To: puzzles@ravenbrook.com Date: Thu, 21 Apr 2005 11:41:40 +0100 Message-ID: <96594.1114080100@thrush.ravenbrook.com> Sender: nb@ravenbrook.com Subject: [puzzles] circle packing in a unit square X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Apr 2005 10:41:41 -0000 Caution: time sink What fraction of a unit square can you cover with N identical non-overlapping circles? What's the largest N for which the best-known fraction is *less* than pi/4? I found some of the current best-known answers mildly surprising. Nick B From rit@pobox.com Thu Apr 21 11:55:11 2005 Received: from bowser.zoonami.com (bowser.zoonami.com [193.112.141.193]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id j3LAtAXj017093 for ; Thu, 21 Apr 2005 11:55:11 +0100 (BST) (envelope-from rit@pobox.com) Received: from zoltar.pobox.com (zoltar.zoonami.com [193.112.141.208]) by bowser.zoonami.com (8.12.11/8.12.11) with ESMTP id j3LArpb0040886; Thu, 21 Apr 2005 11:53:52 +0100 (BST) (envelope-from rit@pobox.com) Message-Id: <5.0.2.1.2.20050421110136.033667e0@pop.ntlworld.com> X-Sender: (Unverified) X-Mailer: QUALCOMM Windows Eudora Version 5.0.2 Date: Thu, 21 Apr 2005 11:02:50 +0000 To: Maths puzzles and solutions From: Richard Tucker Subject: Re: [puzzles] circle packing in a unit square Cc: puzzles@ravenbrook.com In-Reply-To: <96594.1114080100@thrush.ravenbrook.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" X-Virus-Scanned: clamd / ClamAV version 0.74, clamav-milter version 0.74a on bowser.zoonami.com X-Virus-Status: Clean X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Apr 2005 10:55:11 -0000 Nick Barnes wrote: >Caution: time sink > >What fraction of a unit square can you cover with N identical >non-overlapping circles? For pedants: the circles can be whatever size you like, but must be entirely within the square. r/ From nb@ravenbrook.com Fri May 6 12:28:46 2005 Received: from thrush.ravenbrook.com (thrush.ravenbrook.com [193.112.141.145]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id j46BSkXj050194 for ; Fri, 6 May 2005 12:28:46 +0100 (BST) (envelope-from nb@ravenbrook.com) Received: from thrush.ravenbrook.com (localhost [127.0.0.1]) by thrush.ravenbrook.com (8.12.9p2/8.12.9) with ESMTP id j46BSkHs056640 for ; Fri, 6 May 2005 12:28:46 +0100 (BST) (envelope-from nb@thrush.ravenbrook.com) From: Nick Barnes To: puzzles@ravenbrook.com Date: Fri, 06 May 2005 12:28:46 +0100 Message-ID: <56639.1115378926@thrush.ravenbrook.com> Sender: nb@ravenbrook.com Subject: [puzzles] Python challenge X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 May 2005 11:28:47 -0000 Nick B From nb@ravenbrook.com Fri May 6 12:55:46 2005 Received: from thrush.ravenbrook.com (thrush.ravenbrook.com [193.112.141.145]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id j46BtkXj051350 for ; Fri, 6 May 2005 12:55:46 +0100 (BST) (envelope-from nb@ravenbrook.com) Received: from thrush.ravenbrook.com (localhost [127.0.0.1]) by thrush.ravenbrook.com (8.12.9p2/8.12.9) with ESMTP id j46BtkHs056760 for ; Fri, 6 May 2005 12:55:46 +0100 (BST) (envelope-from nb@thrush.ravenbrook.com) From: Nick Barnes To: Maths puzzles and solutions Subject: Re: [puzzles] Python challenge In-Reply-To: <56639.1115378926@thrush.ravenbrook.com> from Nick Barnes of "Fri, 06 May 2005 12:28:46 +0100" X-Infosys-URL: ? Date: Fri, 06 May 2005 12:55:46 +0100 Message-ID: <56759.1115380546@thrush.ravenbrook.com> Sender: nb@ravenbrook.com X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 May 2005 11:55:46 -0000 At 2005-05-06 11:28:46+0000, Nick Barnes writes: > BTW: time sink alert. Nick B, stopping after this next one, honest. From nb@ravenbrook.com Fri May 6 13:35:09 2005 Received: from thrush.ravenbrook.com (thrush.ravenbrook.com [193.112.141.145]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id j46CZ8Xj054319 for ; Fri, 6 May 2005 13:35:09 +0100 (BST) (envelope-from nb@ravenbrook.com) Received: from thrush.ravenbrook.com (localhost [127.0.0.1]) by thrush.ravenbrook.com (8.12.9p2/8.12.9) with ESMTP id j46CZ8Hs056935 for ; Fri, 6 May 2005 13:35:08 +0100 (BST) (envelope-from nb@thrush.ravenbrook.com) From: Nick Barnes To: Maths puzzles and solutions Subject: Re: [puzzles] Python challenge In-Reply-To: <56759.1115380546@thrush.ravenbrook.com> from Nick Barnes of "Fri, 06 May 2005 12:55:46 +0100" X-Infosys-URL: ? Date: Fri, 06 May 2005 13:35:08 +0100 Message-ID: <56934.1115382908@thrush.ravenbrook.com> Sender: nb@ravenbrook.com X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 May 2005 12:35:09 -0000 At 2005-05-06 11:55:46+0000, Nick Barnes writes: > At 2005-05-06 11:28:46+0000, Nick Barnes writes: > > > > BTW: time sink alert. > > Nick B, stopping after this next one, honest. I got to number 7 and I've had enough for today. Nick B From rit@pobox.com Wed May 18 14:27:44 2005 Received: from bowser.zoonami.com (bowser.zoonami.com [193.112.141.193]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id j4IDRWXj097883 for ; Wed, 18 May 2005 14:27:32 +0100 (BST) (envelope-from rit@pobox.com) Received: from zoltar.pobox.com (zoltar.zoonami.com [193.112.141.208]) by bowser.zoonami.com (8.12.11/8.12.11) with ESMTP id j4IDOTs7033184 for ; Wed, 18 May 2005 14:24:29 +0100 (BST) (envelope-from rit@pobox.com) Message-Id: <5.0.2.1.2.20050518133512.02b71fe8@pop.ntlworld.com> X-Sender: (Unverified) X-Mailer: QUALCOMM Windows Eudora Version 5.0.2 Date: Wed, 18 May 2005 13:35:51 +0000 To: Maths puzzles and solutions From: Richard Tucker Subject: Re: [puzzles] Python challenge In-Reply-To: <56639.1115378926@thrush.ravenbrook.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" X-Virus-Scanned: clamd / ClamAV version 0.74, clamav-milter version 0.74a on bowser.zoonami.com X-Virus-Status: Clean X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 May 2005 13:27:44 -0000 Similar... except for the python: http://deathball.net/notpron/notpron.htm r/ From Richard.Brooksby@pobox.com Sat Sep 3 11:25:09 2005 Received: from [127.0.0.1] (crow.ravenbrook.com [193.112.141.129]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id j83AP6Vj095122 for ; Sat, 3 Sep 2005 11:25:09 +0100 (BST) (envelope-from Richard.Brooksby@pobox.com) Mime-Version: 1.0 (Apple Message framework v733) References: Content-Type: text/plain; charset=US-ASCII; format=flowed Message-Id: <4DC4FBA5-0E75-4154-85F7-78F141D3EB70@pobox.com> Content-Transfer-Encoding: 7bit From: Richard Brooksby Date: Sat, 3 Sep 2005 19:25:04 +0900 To: puzzles@ravenbrook.com X-Mailer: Apple Mail (2.733) Subject: [puzzles] Fwd: 1 Puzzles moderator request(s) waiting X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 03 Sep 2005 10:25:10 -0000 Does anyone know this person? I suspect it's spam. Begin forwarded message: > From: puzzles-bounces@ravenbrook.com > Date: 2005-09-03 16:00:02 GMT+09:00 > To: puzzles-owner@ravenbrook.com > Subject: 1 Puzzles moderator request(s) waiting > > > The Puzzles@ravenbrook.com mailing list has 1 request(s) waiting for > your consideration at: > > http://mailman.ravenbrook.com/mailman/admindb/puzzles > > Please attend to this at your earliest convenience. This notice of > pending requests, if any, will be sent out daily. > > Pending subscriptions: > arjun_k10@yahoo.com (arjun) Fri Aug 26 14:22:02 2005 > > From nb@ravenbrook.com Sun Sep 4 19:01:50 2005 Received: from thrush.ravenbrook.com (thrush.ravenbrook.com [193.112.141.145]) by raven.ravenbrook.com (8.12.6p3/8.12.6) with ESMTP id j84I1nVj072685 for ; Sun, 4 Sep 2005 19:01:50 +0100 (BST) (envelope-from nb@ravenbrook.com) Received: from thrush.ravenbrook.com (localhost [127.0.0.1]) by thrush.ravenbrook.com (8.12.9p2/8.12.9) with ESMTP id j84I1nhi051529 for ; Sun, 4 Sep 2005 19:01:49 +0100 (BST) (envelope-from nb@thrush.ravenbrook.com) From: Nick Barnes To: Maths puzzles and solutions Subject: Re: [puzzles] Fwd: 1 Puzzles moderator request(s) waiting In-Reply-To: <4DC4FBA5-0E75-4154-85F7-78F141D3EB70@pobox.com> from Richard Brooksby of "Sat, 03 Sep 2005 19:25:04 +0900" X-Infosys-URL: ? Date: Sun, 04 Sep 2005 19:01:49 +0100 Message-ID: <51528.1125856909@thrush.ravenbrook.com> Sender: nb@ravenbrook.com X-BeenThere: puzzles@ravenbrook.com X-Mailman-Version: 2.1.3 Precedence: list Reply-To: Maths puzzles and solutions List-Id: Maths puzzles and solutions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Sep 2005 18:01:50 -0000 At 2005-09-03 10:25:04+0000, Richard Brooksby writes: > Does anyone know this person? I suspect it's spam. > > arjun_k10@yahoo.com (arjun) Fri Aug 26 14:22:02 2005 Not me. Nick B