Billiards in ellipses revisited
Billiards in ellipses revisited
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DOI:
10.1007/s40879-020-00426-9
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发表时间:
2020-09-09
影响因子:
0.6
通讯作者:
Tabachnikov, Serge
中科院分区:
文献类型:
--
作者:
Akopyan, Arseniy;Schwartz, Richard;Tabachnikov, Serge
We prove some recent experimental observations of Dan Reznik concerning periodic billiard orbits in ellipses. For example, the sum of cosines of the angles of a periodic billiard polygon remains constant in the 1-parameter family of such polygons (that exist due to the Poncelet porism). In our proofs, we use geometric and complex analytic methods.