There's a nice physics problem about the equivalent resistance between two nearest points, if one is considering an infinite square lattice with 1 ohm resisters between nearest points. -----Original Message----- From: math-fun-bounces@mailman.xmission.com [mailto:math-fun-bounces@mailman.xmission.com] On Behalf Of Adam P. Goucher Sent: Friday, January 28, 2011 9:49 AM To: math-fun Subject: Re: [math-fun] The people you know... I can't resist posing the following question: "Connect two people with a one-ohm resistor if they mutually know each other. What is the mean resistance between each pair of people?" You could, as Mike Stay suggested, replace this problem with an analogous one about a given social network. Sincerely, Adam P. Goucher _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun