A note on Lagrangian loci of quotients

Details A note on Lagrangian loci of quotients A note on Lagrangian loci of quotients

2003-03-26

arxiv.org/abs/math/0303322v3

Mathematics

Symplectic Geometry

15 pages, Theorem 2.9 corrected

Scientific paper

We study hamiltonian actions of compact groups in the presence of compatible involutions. We show that the lagrangian fixed point set on the symplectically reduced space is isomorphic to the disjoint union of the involutively reduced spaces corresponding to involutions on the group strongly inner to the given one. Our techniques imply that the solution to the eigenvalues of a sum problem for a given real form can be relayed to the quasi-split real form in the same inner class. We also consider invariant quotients with respect to the corresponding real form of the complexified group.

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