Ricci collineations for type B warped space-times (Núñez, Luis; Percoco, Umberto; Carot, J.) Abstract We present the general structure of proper Ricci Collineations (RC) for type B warped space-times. Within this ...

Comment on Ricci Collineations of static spherically symmetric spacetimes (Núñez, Luis; Contreras, Gerardo; Percoco, Umberto; Bertolotti, Ricardo; Carot, J.) Abstract We present a counter example to a theorem given ...