Results 71 to 80 of about 436 (165)

Einstein connection of nonsymmetric pseudo-Riemannian manifold

A.~Einstein considered  a nonsymmetric (0,2)-tensor $G=g+F$, where $g$ is a pseudo-Riemannian metric and $F\ne0$ is skew-symmetric, and a linear connection $\nabla$ with torsion $T$ such that $(\nabla_X\,G)(Y,Z)=-G(T(X,Y),Z)$. M. Prvanovi\'c (1995) obtained the explicit form of the Einstein connection of an almost Hermitian manifold.
Milan Zlatanovic, Vladimir Rovenski
openaire   +2 more sources

On nondegenerate umbilical affine hypersurfaces in recurrent affine manifolds

Annales Universitatis Paedagogicae Cracoviensis: Studia Mathematica, 2004
Let $widetilde{M}$ be a differentiable manifold of dimension $geqslant 5$, which is endowed with a (torsion-free) affine connection $widetildeabla$ of recurrent curvature.
Zbigniew Olszak
doaj  

Commutative curvature operators over four-dimensional generalized symmetric

Sahand Communications in Mathematical Analysis, 2014
Commutative properties of four-dimensional generalized symmetric pseudo-Riemannian manifolds were considered. Specially, in this paper, we studied Skew-Tsankov and Jacobi-Tsankov conditions in 4-dimensional pseudo-Riemannian generalized symmetric ...
Ali Haji-Badali, Masoud Dehghan, Fereshteh Nourmohammadi   +2 more
doaj  

On Spacelike Hypersurfaces in Generalized Robertson–Walker Spacetimes

Axioms
This paper investigates generalized Robertson–Walker (GRW) spacetimes by analyzing Riemannian hypersurfaces within pseudo-Riemannian warped product manifolds of the form (M¯,g¯), where M¯=R×fM and g¯=ϵdt2+f2(t)gM.
Norah Alessa, Mohammed Guediri
doaj   +1 more source

Transformer-Based SFDA by Class-Balanced Multicentric Dynamic Pseudo-Labeling for Privacy-Preserving EEG-Based BCI Systems

Systems
As a common brain-computer interface (BCI) paradigm, electroencephalogram (EEG)-based motor imagery provides a critical pathway for both assistive technology to (restoring communication and control) and active rehabilitation (promoting neural plasticity ...
Jiangchuan Liu, Jiatao Zhang, Cong Hu, Yong Peng   +3 more
doaj   +1 more source

Parallel Spinors on Pseudo-Riemannian Spin C Manifolds

, 2004
We describe, by their holonomy groups, all complete simply connected irreducible non-locally symmetric pseudo-Riemannian SpinC manifolds which admit parallel spinors. So we generalize the Riemannian SpinC case and the pseudo-Riemannian Spin one.
openaire   +4 more sources

RiTex: Harmonization of Radiomic Features Based on Riemannian Geometry. [PDF]

J Imaging
Voitenko DA, Vladzymyrskyy AV, Omelyanskaya OV, Vasilev YA, Blokhin IA, Kodenko MR.   +5 more
europepmc   +1 more source

Local invariants of a pseudo-Riemannian manifold.

MATHEMATICA SCANDINAVICA, 1975
openaire   +2 more sources

GEORCE: a fast new control algorithm for computing geodesics. [PDF]

Inf Geom
Rygaard FM, Hauberg S.
europepmc   +1 more source

Predicting cardiopulmonary exercise testing outcomes in congenital heart disease through multimodal data integration and geometric learning. [PDF]

Sci Rep
Alkan M, Veldtman G, Deligianni F.
europepmc   +2 more sources