An algebraic characterization of \({\mathcal R}\)-spaces
[\textit{D. Ferus} [Math. Ann. 247, 81-93 (1980; Zbl 0446.53041)] characterized all symmetric \(R\)-spaces algebraically by Jordan triple systems. The present authors characterizes general \(R\)-spaces using more general algebraic structures called Euclidean double-triple systems.
scientific article; zbMATH DE number 1098614