space) O(1, n) / O(1, n − 1) of two indefinite orthogonal group(英语:indefinite orthogonal group)s, which shows that it is a non-Riemanniansymmetric space(英语:symmetric
measured along the path between two events, whereas in Euclidean space and Riemannian manifolds, geodesics are paths of shortest distance between two points
Variable II, John B. Conway (1995, ISBN 978-0-387-94460-9) Differential and Riemannian Manifolds, Serge Lang (1995, ISBN 978-0-387-94338-1) Polynomials and Polynomial