Lagrangian submanifolds in complex space forms satisfying an improved equality involving $\delta (2,2)$

Bang-Yen Chen, Alicia Prieto-Marín, Xianfeng Wang

It was proved in [8,9] that every Lagrangian submanifold $M$ of a complex space form ${\tilde{M}}^5(4c)$ of constant holomorphic sectional curvature $4c$ satisfies the following opt…