# Timeline for Which polygons have *simple* periodic billiard paths?

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S Jan 3 '17 at 5:48 history
not Barry Mazur. emphasis.
Jan 3 '17 at 4:34 review
S Jan 3 '17 at 5:48
Feb 7 '15 at 14:28 answer timeline score: 7
Feb 7 '15 at 14:00 answer timeline score: 2
Feb 7 '15 at 11:59 answer timeline score: 2
Feb 7 '15 at 4:36 comment @JoelReyesNoche: Yes, that's what I meant. Nice examples!
Feb 7 '15 at 4:13 comment If the answer to my above question is yes, then isosceles triangles also have simple periodic paths. Start perpendicular to one of the two equal sides then go toward the midpoint of the third side.
Feb 7 '15 at 3:46 comment When you say simple path does that include the case where the path can go back over itself? If so, then a right triangle has a simple periodic path. (math.brown.edu/~res/Papers/billiards1.pdf)
Feb 7 '15 at 3:17 comment "Might every regular polygon have a simple periodic path?" is too narrowly specific, with an easy affirmative answer: such a path (also a regular polygon of the same order) is obtained by joining midpoints of consecutive pairs of sides.
Feb 7 '15 at 1:57 history edited