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On almost Poisson commutativity in dimension two
Frol ZapolskyAbstract
Consider the following question: given two functions on a symplectic manifold whose Poisson bracket is small, is it possible to approximate them in the C^0 norm by commuting functions? We give a positive answer in dimension two, as a particular case of a more general statement which applies to functions on a manifold with a volume form. This result is based on a lemma in the spirit of geometric measure theory. We give some immediate applications to function theory and the theory of quasi-states on surfaces with area forms.
- Received:
- 13.09.10
- Published:
- 15.12.10
- MSC Codes:
- 53D05, 58C35
- Keywords:
- Poisson bracket, quasi-states, surfaces