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Monday, January 30, 2012

Successive reflection

Given 2012 points on the plane: A_1, \dots, A_{2012}, and a point P. Suppose B_1, \dots, B_{2012} is a permutation of the A_is, we determine the shadow of P as follows:

Reflect P with respect to B_1 to obtain P_1. Reflect P_1 with respect to B_2 to obtain P_2, and so on, to arrive with P_{2012}. We call this last point the shadow of P.

Obviously, depending on the permutation of B_is, one may arrive at different shadows of P. Find the maximal numbers of shadows of P over all possible permutations.

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