Convex surfaces in Lorentzian spaces of constant curvature (Q1922784)

In this paper are studied the convex surfaces in Lorentzian spaces of constant curvature; the isometric immersions of compact surfaces with curvature \(K< K_0\), in 3-dimensional Lorentz spaces (with constant curvature \(K_0)\); the existence and uniqueness for some isometric immersions of compact surfaces in de Sitter space. The results may be generalized to complete surfaces.