[carl_corder]

Another interesting and related topic are Ramsey numbers. R(3,3)=6 which means:

"In any party of six people either at least three of them are (pairwise) mutual strangers or at least three of them are (pairwise) mutual acquaintances"

https://en.wikipedia.org/wiki/Theorem_on_friends_and_strange...

[drjesusphd]

This sounds like a tautology. What am I missing?