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C-Periodic boundary conditions

I'm working with linear chain of strongly correlated electrons. These types of models have problems due to finite size effects, this leads one to consider C-Periodic boundary conditions as an attempt ...
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About a letter by Richard Palais of 1965.

In Cushman and Bates, Global Aspects of Classical Integrable Systems, 1997, I have read In a widely circulated but unpublished letter in 1965, Palais explained the symplectic formulation of ...