Riemannian manifolds with almost constant scalar curvature.
r-y r2 variedades diferenciables.
Second order parallel tensor in real and complex space forms.
Semi-symmetric -spaces
We determine explicitly the local structure of a semi-symmetric -space.
Semisymmetry and Ricci-symmetry for Hypersurfaces of Semi-euclidean Spaces
Shells of monotone curves
We determine in the form of curves corresponding to strictly monotone functions as well as the components of affine connections for which any image of under a compact-free group of affinities containing the translation group is a geodesic with respect to . Special attention is paid to the case that contains many dilatations or that is a curve in . If is a curve in and is the translation group then we calculate not only the components of the curvature and the Weyl tensor but...
Simple conformally symmetric manifolds with metric semi-symmetric connection
Some Additive Designs
Given a finite additive abelian group and an integer , with , denote by the simple incidence structure whose point-set is and whose blocks are the -subsets of such that . It is known (see [Caggegi, A., Di Bartolo, A., Falcone, G.: Boolean 2-designs and the embedding of a 2-design in a group arxiv 0806.3433v2, (2008), 1–8.]) that is a 2-design, if is an elementary abelian -group with a prime divisor of . From [Caggegi, A., Falcone, G., Pavone, M.: On the additivity of block...
Some curvature identities for commutative spaces
Some invariant theorems on geometry of Einstein non-symmetric field theory.
Some maximal graduation classes and their Riemannian properties
Some new conformal covariants.
Some Nonsemisymmetric Ricci-semisymmetric Warped Product Hypersurfaces
Some properties of fundamental bipoint tensor
Some regularity theorems in riemannian geometry
Some remarks on metric semisymmetric connections. (Quelques remarques sur les connexions semi-symétriques métriques.)
Some Remarks on the Nonorientable Surfaces
Some results on projectively flat affine surfaces
We focus our attention on projectively flat affine surfaces. First, we classify the affine surfaces with projectively flat induced connection and constant Pick invariant. We also investigate the compact case and study how the geometry at the boundary determines the geometry of the surface.
Special Einstein’s equations on Kähler manifolds
This work is devoted to the study of Einstein equations with a special shape of the energy-momentum tensor. Our results continue Stepanov’s classification of Riemannian manifolds according to special properties of the energy-momentum tensor to Kähler manifolds. We show that in this case the number of classes reduces.
Stanilov-Tsankov-Videv theory.