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B. 4763. Let $\displaystyle G$ be a simple undirected graph of $\displaystyle n$ vertices. Prove that it is possible to assign infinite sets $\displaystyle \mathcal{H}_1,\mathcal{H}_2, \dots, \mathcal{H}_n$ of natural numbers to the graph such that the intersection of two sets is infinite if the corresponding vertices are joined by an edge, and empty if there is no edge joining the vertices.

Proposed by G. Mészáros, Budapest

(4 points)

Deadline expired on 10 February 2016.

Statistics on problem B. 4763.
 106 students sent a solution. 4 points: 99 students. 3 points: 3 students. 2 points: 2 students. 1 point: 1 student. Unfair, not evaluated: 1 solution.

• Problems in Mathematics of KöMaL, January 2016

•  Támogatóink: Morgan Stanley