From jcowan@reutershealth.com Thu May 16 10:36:32 2002 Return-Path: X-Sender: jcowan@reutershealth.com X-Apparently-To: lojban@yahoogroups.com Received: (EGP: mail-8_0_3_2); 16 May 2002 17:36:32 -0000 Received: (qmail 603 invoked from network); 16 May 2002 17:36:32 -0000 Received: from unknown (66.218.66.218) by m1.grp.scd.yahoo.com with QMQP; 16 May 2002 17:36:32 -0000 Received: from unknown (HELO mail.reutershealth.com) (204.243.9.36) by mta3.grp.scd.yahoo.com with SMTP; 16 May 2002 17:36:31 -0000 Received: from skunk.reutershealth.com (IDENT:cowan@[10.65.117.21]) by mail.reutershealth.com (Pro-8.9.3/Pro-8.9.3) with SMTP id NAA11895 for ; Thu, 16 May 2002 13:36:02 -0400 (EDT) Message-Id: <200205161736.NAA11895@mail.reutershealth.com> Received: by skunk.reutershealth.com (sSMTP sendmail emulation); Thu, 16 May 2002 13:36:29 -0400 Subject: Re: [lojban] zgamuvjga To: lojban@yahoogroups.com Date: Thu, 16 May 2002 13:36:29 -0400 (EDT) In-Reply-To: <20020516131322.S44426-100000@granite.thestonecutters.net> from "Invent Yourself" at May 16, 2002 01:20:45 PM X-Mailer: ELM [version 2.5 PL3] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit From: John Cowan X-Yahoo-Group-Post: member; u=8122456 X-Yahoo-Profile: john_w_cowan Invent Yourself scripsit: > x1 is the parallax of x2 as seen by x3 who moves to x4 from x5 I don't understand what x3 has to do with it, frankly. I can talk about the parallax of an object on the opposite wall from one side of a room vs. the other side, without postulating an observer who actually moves across the room. Furthermore, an important case of parallax is the parallax between a single observer's left and right eyes, which is the basis of depth perception, and obviously does not involve any sort of motion. So I propose: x1 is the parallax of x2 at observation point x3 relative to observation point x4. -- John Cowan http://www.reutershealth.com I amar prestar aen, han mathon ne nen, http://www.ccil.org/~cowan han mathon ne chae, a han noston ne 'wilith. --Galadriel, _LOTR:FOTR_