Re: New <AREA> syntax proposal

Jeff de la Beaujardiere (delabeau@iniki.gsfc.nasa.gov)
Tue, 10 Jun 1997 10:33:36 -0400 

Date: Tue, 10 Jun 1997 10:33:36 -0400
Message-Id: <199706101433.KAA26337@iniki.gsfc.nasa.gov>
From: Jeff de la Beaujardiere <delabeau@iniki.gsfc.nasa.gov>
To: colin@bespin.demon.co.uk
CC: www-html@w3.org
In-reply-to: <nAUldpBlASnzEwo4@tne.co.uk> (message from Colin F Reynolds on
Subject: Re: New <AREA> syntax proposal


Colin F Reynolds writes:
> Don't most area maps use four colo(u)rs, that being the maximum number of
> colors required to assure that no two adjacent regions bear the same
> color?

Four is the *minimum*, which is probably what you meant to write.
Interestingly, this conjecture took over a century to prove, and the
proof requires an entire book (see
http://www.math.utah.edu/~alfeld/math/4color.html).  But I digress...

--Jeff

  = J-F Pitot de La Beaujardiere
  = delabeau@iniki.gsfc.nasa.gov
  = http://globe2.gsfc.nasa.gov/