Mathematics – Differential Geometry
Scientific paper
1999-12-22
Lett. Math. Phys. 52 (2000), 93-102.
Mathematics
Differential Geometry
In memory of Moshe Flato; 12 pages
Scientific paper
In this survey, we discuss a series of linearization problems--for Poisson structures, Lie algebroids, and Lie groupoids. The last problem involves a conjecture on the structure of proper groupoids. Attempting to prove this by the method of averaging leads to problems concerning almost actions of compact groups and almost invariant submanifolds for compact group actions. The paper ends with a discussion of possible extensions of the convexity theorems for momentum maps of hamiltonian actions of compact groups.
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