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Article #430Re: Synchonizing watches
From: pds
Date: Fri, 04 Sep 1992 14:08
Date: Fri, 04 Sep 1992 14:08
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1669 bytes
In article <1992Sep3.201917.25468@hubcap.clemson.edu>, mailrus!samsung!ulowell!cs.ulowell.edu!wex@uunet.UU.NET (Paul M. Wexelblat) writes: > OK A --->B: "I'm going to say "BONG" as soon as my second hand > reaches the 12, when you hear the "BONG", start counting seconds > on your watch out loud. > > A says "BONG" and times AB+BA seconds; at the end of that time the number > B has reached is the BA delay I don't think so. A says "BONG" at t=0. At t=AB, B hears "BONG" and starts counting, saying "zero" at t=AB, "one" at t=AB+1, ... A will hear "zero" at time AB+BA - there is no way for A to know what number B has reached because A won't hear it for another BA seconds. I think the earlier proof that no solution exists looked right. Patrick --------------------------------------------------------------------------- Engineers think that theory approximates reality | Mathematicians never Physicists think that reality approximates theory | make the connection --------------------------------------------------------------------------- Patrick Surry, JCMB 2254, Edinburgh, Scotland e||) Edinburgh Parallel EMail: pds@epcc.ed.ac.uk Tel: (031) 650-5960 c||c Computing Centre ---------------------------------------------------------------------------
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Path: arc1-ca.pugleaf.net!sparky!uunet!stanford.edu!sun-barr!sh.wide!wnoc-snd-ss2!akiu!hakata!kyu-cs!lab!nttlab!daemon From: pds@epcc.edinburgh.ac.uk Newsgroups: fj.mail-lists.parallel Subject: Re: Synchonizing watches Message-ID: <314972@nttlab.ntt.JP> Date: 4 Sep 92 14:08:47 GMT Sender: daemon@nttlab.ntt.JP Distribution: fj Lines: 25 Approved: news@nttlab.ntt