The pages below contain 100s of loci of triangle centers for N-periodics in the elliptic billiard, more info in [1].
The following image galleries have been assembled:
Any comments, ideas, corrections, suggestions, and proofs contributed are very welcome. Email me at: dreznik _theat_ gmail _thedot_ com
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[1] Reznik D, Garcia R, Koiller J. 2019.Math Intelligencer. Available from: https://arxiv.org/abs/1911.01515,.