Neocijenjeno
9. travnja 2018. 01:31 (5 godine, 11 mjeseci)
A rectangle D is partitioned in several (\ge2) rectangles with sides parallel to those of D. Given that any line parallel to one of the sides of D, and having common points with the interior of D, also has common interior points with the interior of at least one rectangle of the partition; prove that there is at least one rectangle of the partition having no common points with D's boundary.

Author: unknown author, Japan
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