3 papers
math.DG2026
Godbillon-Vey classes of Lie subalgebroids
Shuhei Yonehara
The Godbillon-Vey class is a secondary characteristic class which is defined for regular foliations and have been studied extensively. On the other hand, extending the Godbillon-Ve…
math.DG2024
Godbillon-Vey classes of regular Jacobi manifolds
Shuhei Yonehara
The notion of a Jacobi manifold is a natural generalization of that of a Poisson manifold. A Jacobi manifold has a natural foliation in which each leaf has either a contact structu…
math.SG2024
Mikami-Weinstein Type Theorem for Cosymplectic Groupoid Actions
Shuhei Yonehara
The Mikami-Weinstein theorem is a generalization of the classical Marsden-Weinstein-Meyer symplectic reduction theorem to the case of symplectic groupoid actions. In this paper, we…