Difference between revisions of "2007 IMO Problems/Problem 3"
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| − | + | * [http://sneezy.cs.nott.ac.uk/tmc/wp-content/uploads/2007/10/cliqueproblem.pdf TMC solution to Problem 3, IMO 2007] | |
| − | + | * [http://sneezy.cs.nott.ac.uk TMC webpage] | |
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Revision as of 09:03, 28 October 2007
Problem
In a mathematical competition some competitors are friends. Friendship is always mutual. Call a group of competitors a clique if each two of them are friends. (In particular, any group of fewer than two competitors is a clique.) The number of members of a clique is called its size. Given that, in this competition, the largest size of a clique is even, prove that the competitors can be arranged in two rooms such that the largest size of a clique contained in one room is the same as the largest size of a clique contained in the other room.
Solution
The Nottingham Tuesday Club members solved this problem and published their solution in their website. The solution is a PDF document.
