C-Bochner tensor Casorati curvature Darboux frame Euclidean submanifold Frenet frame Hessian manifolds Hessian sectional curvature Hodge–Laplacian Kähler–Einstein metrics L2-Stokes theorem L2-harmonic forms Minkowski plane Minkowskian angle Minkowskian length Minkowskian pseudo-angle Q1-390 QA1-939 Reeb flow symmetry Ricci curvature Ricci operator Ricci soliton Sasakian manifold Sasakian statistical manifold T-submanifolds affine hypersurface affine sphere anti-invariant bic Book Industry Communication::P Mathematics & science capacity centrodes