In this paper,we discuss the Lagrangian angle and the Kahler angle of immersed surfaces in C^2.Firstly,we provide an extension of Lagrangian angle,Maslov form a
A pair of Banach spaces (X, Y) is said to be stable if for every £-isometry f : X→Y,there exist γ> 0 and a bounded linear operator T : L(f)→X with ||T||≤α s