For coin billiards, invariant curves exist for small heights or near-circular coins, vanish near the boundary for tall non-circular coins, and a complete foliation by invariant curves occurs only for circular coins.
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Existence and Nonexistence of Invariant Curves of Coin Billiards
For coin billiards, invariant curves exist for small heights or near-circular coins, vanish near the boundary for tall non-circular coins, and a complete foliation by invariant curves occurs only for circular coins.