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when toggle format what by license comment
May 14, 2015 at 0:02 history edited Qfwfq CC BY-SA 3.0
(little typo in title)
May 13, 2015 at 21:30 history edited Ricardo Andrade CC BY-SA 3.0
replaced deprecated tag 'geometry'; edited title
Oct 13, 2010 at 11:26 answer added Joseph O'Rourke timeline score: 10
Oct 13, 2010 at 9:26 comment added Roland Bacher The boundary of the polygon can of course always be supposed to be covered by mirrors (and it reflects then light-rays in the same ways as a polygonal billiard) without loss of generality.
Oct 13, 2010 at 9:10 history asked Roland Bacher CC BY-SA 2.5