Invariant symmetries on non-reductive homogeneous pseudo-Riemannian four-manifolds
The aim of this work is to classify invariant Ricci collineations of all four-dimensional non-reductive homogeneous pseudo-Riemannian manifolds. Moreover, a classification of invariant matter collineations for the Lorentzian case is obtained.
scientific article; zbMATH DE number 6484512
scientific article