Abstract
We prove that there exists an infinite-dimensional Poisson subalgebra in a C ∞(ℝ2n) invariant with respect to the Moyal bracket but not rigid, i.e., admitting nontrivial deformations.
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Cortet, J.C., Marrakchi, M. On deformations of a subalgebra of the poisson lie algebra C ∞ ((ℝ2n). Letters in Mathematical Physics 12, 309–313 (1986). https://doi.org/10.1007/BF00402664
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DOI: https://doi.org/10.1007/BF00402664