12 citations · 29 across the 14 of their papers we have counts for
16 papers
Four-dimensional almost-Einstein manifolds with circulant structures
Iva Dokuzova, Georgi Dzhelepov, Dimitar Razpopov
This paper considers a four-dimensional Riemannian manifold with an additional circulant tensor structure . We prove that such a manifold is almost-Einstein if the curvature ten…
Three-dimensional Riemannian manifolds associated with locally conformal Riemannian product manifolds
Iva Dokuzova
A 3-dimensional Riemannian manifold equipped with a tensor structure of type , whose fourth power is the identity, is considered. This structure acts as an isometry with res…
Spheres and circles with respect to an indefinite metric on a Riemanian manifold with a skew-circulant structure
Georgi Dzhelepov, Iva Dokuzova, Dimitar Razpopov
We study hyper-spheres, spheres and circles, with respect to an indefinite metric, in a tangent space on a 4-dimensional differentiable manifold. The manifold is equipped with a po…
Curvature properties of Riemannian manifolds with skew-circulant structures
Iva Dokuzova
We consider a 4-dimensional Riemannian manifold M endowed with a right skew-circulant tensor structure S, which is an isometry with respect to the metric g and the fourth power of…
A Riemannian manifold with skew-circulant structures and an associated locally conformal Kähler manifold
Dimitar Razpopov, Iva Dokuzova
A 4-dimensional Riemannian manifold M, equipped with an additional tensor structure S, whose fourth power is minus identity, is considered. The structure S has a skew-circulant mat…
On 3-dimensional almost Einstein manifolds with circulant structures
Iva Dokuzova
A 3-dimensional Riemannian manifold equipped with a tensor structure of type , whose third power is the identity, is considered. This structure and the metric have circulant…