IMC 2014, Problem 9
Source: IMC 2014
July 27, 2016
IMCcollege contestsset theory
Problem Statement
We say that a subset of is -almost contained by a hyperplane if there are less than points in that set which do not belong to the hyperplane. We call a finite set of points -generic if there is no hyperplane that -almost contains the set. For each pair of positive integers , find the minimal number of such that every finite -generic set in contains a -generic subset with at most elements.(Proposed by Shachar Carmeli, Weizmann Inst. and Lev Radzivilovsky, Tel Aviv Univ.)