Gürses, Metin2016-02-082016-02-0819930031-9007http://hdl.handle.net/11693/26073Some new symmetry algebras are found for the vacuum Einstein equations. Among them there exists an infinite-dimensional algebra representing the symmetries analogous to the generalized symmetries of the integrable nonlinear partial differential equations.EnglishArticle10.1103/PhysRevLett.70.3671079-7114