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In this article, motivated by the study of symplectic structures on manifolds with boundary and the systematic study of b-symplectic manifolds started in Guillemin, Miranda, and Pires Adv. Math. 264 (2014), 864-896, we prove a slice theorem for Lie group actions on b-symplectic manifolds.
Daniel Kressner, Axel Elie Joseph Séguin, Gianluca Ceruti