arXiv · 1004.0028
The manifold M being compact and connected, we prove that every submanifold of its cotangent bundle that is Hamiltonianly isotopic to the zero-section and that is invariant by a Tonelli flow is a graph.
Marie-Claude Arnaud. 2010-03-31. On a theorem due to Birkhoff. https://arxiv.org/abs/1004.0028
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