Results 51 to 60 of about 5,017 (222)
2‐Conformal Vector Fields on the Model Sol Space and Hyperbolic Ricci Solitons
Journal of Mathematics, Volume 2025, Issue 1, 2025.In this study, we present the notion of 2‐conformal vector fields on Riemannian and semi‐Riemannian manifolds, which are an extension of Killing and conformal vector fields. Next, we provide suitable vector fields in Sol space that are 2‐conformal. A few implications of 2‐conformal vector fields in hyperbolic Ricci solitons are investigated.
Rawan Bossly +3 more
wiley +1 more source
A Theoretical Investigation of Channel Wave Multipath Propagation in a Coal Seam
Mathematical Problems in Engineering, Volume 2019, Issue 1, 2019., 2019 This study investigates the mechanism of channel wave multipath propagation to determine features of a channel wave in a coal seam. For this purpose, deduction formulas were used for different time delays and propagation paths and, subsequently, a multipath fading channel wave pattern was built. MATLAB software was used to simulate the model.
Yinjing Guo +4 more
wiley +1 more source
Linear sets in the projective line over the endomorphism ring of a finite field
, 2016 Let $\mathrm{PG}(1,E)$ be the projective line over the endomorphism ring $E=End_q({\mathbb F}_{q^t})$ of the $\mathbb F_q$-vector space ${\mathbb F}_{q^t}$.
Havlicek, Hans, Zanella, Corrado
core +1 more source
Irrigation and Drainage, Volume 73, Issue 3, Page 988-1009, July 2024.Abstract In this study, the performance of a one‐source surface energy balance (OSEB) remote sensing (RS) of actual crop evapotranspiration (ETa), incorporating data from different spaceborne, airborne and proximal multispectral data, was evaluated. The RS platforms in this study included Landsat‐8 (30 m pixel size), Sentinel‐2 (10 m), Planet CubeSat ...
Edson Costa‐Filho +2 more
wiley +1 more source
Homotheties of a Class of Spherically Symmetric Space‐Time Admitting G3 as Maximal Isometry Group
Advances in Mathematical Physics, Volume 2018, Issue 1, 2018., 2018 The homotheties of spherically symmetric space‐time admitting G4, G6, and G10 as maximal isometry groups are already known, whereas, for the space‐time admitting G3 as isometry groups, the solution in the form of differential constraints on metric coefficients requires further classification. For a class of spherically symmetric space‐time admitting G3
Daud Ahmad +2 more
wiley +1 more source
Automorphisms and opposition in twin buildings
, 2012 We show that every automorphism of a thick twin building interchanging the halves of the building maps some residue to an opposite one. Furthermore we show that no automorphism of a locally finite 2-spherical twin building of rank at least 3 maps every ...
Devillers, Alice +2 more
core +1 more source
Two dimensional dynamical systems which admit Lie and Noether symmetries
, 2011 We prove two theorems which relate the Lie point symmetries and the Noether symmetries of a dynamical system moving in a Riemannian space with the special projective group and the homothetic group of the space respectively.
Aminova A V +12 more
core +1 more source
, 2006 Let $N$ be a nilpotent group normal in a group $G$. Suppose that $G$ acts transitively upon the points of a finite non-Desarguesian projective plane $\mathcal{P}$.
Gill, Nick
core +2 more sources
Concircular vector fields for Kantowski Sachs and Bianchi type III spacetimes
, 2017 This paper intends to obtain concircular vector fields of Kantowski Sachs and Bianch type III spacetimes. For this purpose, ten conformal Killing equations and their general solution in the form of conformal Killing vector fields are derived along with ...
Ali, Ahmad T +2 more
core +1 more source
Science, 1942 (Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
openaire +4 more sources