A C0-Hamiltonian twist map on a Liouville domain with symplectic cohomology nonzero in infinitely many degrees is claimed to have arbitrarily long interior periodic orbits, but the proof's action-growth exclusion of boundary orbits is not justified.
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A Poincar\'e--Birkhoff theorem for $C^0$-Hamiltonian maps
A C0-Hamiltonian twist map on a Liouville domain with symplectic cohomology nonzero in infinitely many degrees is claimed to have arbitrarily long interior periodic orbits, but the proof's action-growth exclusion of boundary orbits is not justified.