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Poisson brackets, quasi-states and symplectic integrators
This paper is a fusion of a survey and a research article. We
focus on certain rigidity phenomena in function spaces associated
to a symplectic manifold. Our starting point is a lower bound
obtained in an earlier paper with Zapolsky for the uniform norm of
the Poisson bracket of a pair of functions in terms of symplectic
quasi-states. After a short review of the theory of symplectic
quasi-states we extend this bound to the case of iterated Poisson
brackets. A new technical ingredient is the use of symplectic
integrators. In addition, we discuss some applications to
symplectic approximation theory and present a number of open
problems.