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From: das@ucla-cs.UUCP
Newsgroups: net.math
Subject: Re: Dot Town, U.S.A.
Message-ID: <969@ucla-cs.ARPA>
Date: Mon, 27-Aug-84 22:58:40 EDT
Article-I.D.: ucla-cs.969
Posted: Mon Aug 27 22:58:40 1984
Date-Received: Wed, 29-Aug-84 05:38:01 EDT
References: <2479@hplabsb.UUCP>
Organization: UCLA CS Dept.
Lines: 14

...
This is an interesting variant of a puzzle I read, involving unfaithful
spouses instead of dots, but it works the same way.  I think you left off
two necessary conditions:

2') Everyone in Dot Town is a perfect logician, AND EVERYONE IN DOT TOWN
    KNOWS THIS FACT.

5) Although Dot Town residents gather to look at each other's dots, no one
   ever says anything about anyone else's dot.  (And the only thing they
   "say" about their own dot is killing themselves in the evening of the
   day they determine their own dot's color.)

-- David Smallberg, das@ucla-cs.ARPA, {ihnp4,ucbvax}!ucla-cs!das