
Transformation to pseudo-Cartesian coordinates in locally flat pseudo-Riemannian spaces
Keywords: جداسازی متغیرها; Riemannian geometry; Lorentzian geometry; Separation of variables53A45; 53B20; 53B50; 53C21; 70H20Flat pseudo-Riemannian spaces; Curvilinear coordinates; Parallel covector fields; Hamilton–Jacobi theory; Separation of variables