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1964年第6届IMO的第4题(匈牙利命题)是一个组合问题:十七个人两两通信,他们在通信中讨论的仅有三个不同问题,且任意两个人通信时只讨论一个问题.则至少有三个人互相通信时讨论的是同一个问题.
Question 6 (the Hungarian proposition) of the 6th IMO in 1964 is a combinatorial problem: seventeen individuals communicate with each other on two occasions, they have only three different issues discussed in communications, and only one question is discussed when any two people communicate. At least three people are talking about the same issue when communicating with each other.