From cube-lovers-errors@mc.lcs.mit.edu Sun Jul 27 22:51:19 1997 Return-Path: Received: from sun30.aic.nrl.navy.mil by mc.lcs.mit.edu (8.8.1/mc) with SMTP id WAA00608; Sun, 27 Jul 1997 22:51:19 -0400 (EDT) Precedence: bulk Errors-To: cube-lovers-errors@mc.lcs.mit.edu Mail-from: From Hoey@AIC.NRL.Navy.Mil Sun Jul 27 22:45:48 1997 Date: Sun, 27 Jul 1997 22:45:37 -0400 Message-Id: <199707280245.WAA12048@sun30.aic.nrl.navy.mil> From: Dan Hoey To: cube-lovers@ai.mit.edu Cc: Nicholas Bodley Subject: Administrata and a reference The administrata is that Alan Bawden has asked me to take over cube-lovers-request for a few weeks, while he is recovering from surgery. After seventeen years of running cube-lovers, he deserves a vacation, but I would rather he find someplace more pleasant to spend it than a hospital. I'm sure we all wish him a speedy recovery. I will be adding and removing addresses and filtering out abuse, but I will not be updating the archives or the collection of reader contributions. As always, send to cube-lovers-request@ai.mit.edu for administrative services. The reference is for Nicholas Bodley, who in one of his very informative messages on Rubik's Revenge raised questions of the possible orientations achievable by the internal sphere without changing the exterior. I answered that question in my message on "Invisible Revenge" on 9 August 1982. The sphere can be placed in any of 24 orientations, and I showed how to do so. If we consider the sphere modulo its functional symmetry (fixing one corner of the cube) we will distinguish only 8 of these orientations. I also mentioned how to determine which of these 8 orientations the interior sphere is in on a physical cube, without disassembly. See ftp://ftp.ai.mit.edu/pub/cube-lovers/cube-mail-4 for details. Dan Hoey Hoey@AIC.NRL.Navy.Mil