In the context of paracontact geometry, $\eta $-Ricci solitons are considered on manifolds
satisfying certain curvature conditions: $(\xi,\cdot) _ {R}\cdot S= 0$, $(\xi,\cdot) _ {S}\cdot R …

The Eisenhart problem of finding parallel tensors is solved for the symmetric case in the
regular $ f $-Kenmotsu framework. On this way, the Olszack-Rosca example of Einstein …

We set a type of semi-symmetric metric connection on the Lorentzian manifolds. It is proved
that a Lorentzian manifold endowed with a semi-symmetric metric ρ ρ-connection is a GRW …

We study Ricci solitons in Lorentzian α-Sasakian manifolds. It is shown that a symmetric
parallel second order covariant tensor in a Lorentzian α-Sasakian manifold is a constant …

The aim of this paper is to study two problems in the framework of paracontact geometry of
dimension 3 3, namely, the class of parallel symmetric tensor fields of (0, 2)(0, 2)-type and …

In 1923, Eisenhart [9] proved that if a positive definite Riemannian manifold (M, g) admits a
second order parallel symmetric covariant tensor other than a constant multiple of the metric …

The Eisenhart problem of finding parallel tensors treated already in the framework of quasi-
constant curvature manifolds in\cite {x: j} is reconsidered for the symmetric case and the …

ON GRADIENT η-EINSTEIN SOLITONS 1. Introduction In the same way like the Ricci solitons
generate self-similar solutions to Ricc Page 1 Kragujevac Journal of Mathematics Volume …

Sažetak The object of this paper is to study η-Ricci solitons on (ε)-almost paracontact metric
manifolds. We investigate η-Ricci solitons in the case when its potential vector field is exactly …

We define a class of semi-symmetric metric connection on a Riemannian manifold for which
the conformal, the projective, the concircular, the quasi conformal and the m-projective …