Answer a question more than 60 days later with score of 5 or more. This badge can be awarded multiple times.
earned this badge 3 times
What is the minimum N for which there exist N points in the plane that cannot be covered by any number of non-overlapping closed unit discs?
Awarded oct 3 at 2:08
Awarded dec 1 '12 at 22:50
Awarded may 27 '11 at 15:35