Talk:Theorem on friends and strangers

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Friendship theorem should not redirect to this page. The friendship theorem states that when you have n people, n at least four, and every two people have a unique friend in common (regardless of whether or not they are friends) , the number of people is odd, and the configuration is as a windmill : one person is friends with everyone, all the others have exactly two friends. Here is a source : http://www.maths.qmul.ac.uk/~pjc/comb/ch11s.pdf Evilbu 20:25, 11 February 2006 (UTC)