Theorem on Friends and Strangers; Why in Any Party of Six People, Either at Least Three of Them Are Mutual Friends, or at Least Three of Them Are Mutual Strangers
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Let’s take a look at Alice first. To her, each one of the other five (Bob, Carol, Dave, Ellen, and Frank) is either a friend or a stranger. Suppose Bob, Dave, and Frank are friends to Alice, and…

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SOLVED: Prove this theorem: Among any six people, there exists a group of 3 mutual friends or a group of 3 mutual strangers. (Here friends and strangers are considered symmetric relations, i.e.

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Theorem on Friends and Strangers. Ramsey Theory and Graham's Number, by Francesco Di Lallo
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por adulto (o preço varia de acordo com o tamanho do grupo)