IMO Shortlist 1987 problem 9


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2. travnja 2012.
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Does there exist a set M in usual Euclidean space such that for every plane \lambda the intersection M \cap \lambda is finite and nonempty ?

Proposed by Hungary.

RemarkI'm not sure I'm posting this in a right Forum.
Izvor: Međunarodna matematička olimpijada, shortlist 1987