Results 21 to 30 of about 5,017 (222)
The minimum degree of minimal Ramsey graphs for cliques
Bulletin of the London Mathematical Society, Volume 54, Issue 5, Page 1827-1838, October 2022., 2022 Abstract We prove that sr(Kk)=O(k5r5/2)$s_r(K_k) = O(k^5 r^{5/2})$, where sr(Kk)$s_r(K_k)$ is the Ramsey parameter introduced by Burr, Erdős and Lovász in 1976, which is defined as the smallest minimum degree of a graph G$G$ such that any r$r$‐colouring of the edges of G$G$ contains a monochromatic Kk$K_k$, whereas no proper subgraph of G$G$ has this ...
John Bamberg +2 more
wiley +1 more source
ρ‐Einstein Solitons on Warped Product Manifolds and Applications
Journal of Mathematics, Volume 2022, Issue 1, 2022., 2022 The purpose of this research is to investigate how a ρ‐Einstein soliton structure on a warped product manifold affects its base and fiber factor manifolds. Firstly, the pertinent properties of ρ‐Einstein solitons are provided. Secondly, numerous necessary and sufficient conditions of a ρ‐Einstein soliton warped product manifold to make its factor ρ ...
Nasser Bin Turki +5 more
wiley +1 more source
Conformally Flat Pseudoprojective Symmetric Spacetimes in fR,G Gravity
Advances in Mathematical Physics, Volume 2022, Issue 1, 2022., 2022 Sufficient conditions on a pseudoprojective symmetric spacetime (PPS)n whose Ricci tensor is of Codazzi type to be either a perfect fluid or Einstein spacetime are given. Also, it is shown that a (PPS)n is Einstein if its Ricci tensor is cyclic parallel. Next, we illustrate that a conformally flat (PPS)n spacetime is of constant curvature.
Uday Chand De +4 more
wiley +1 more source
, 2022 Published as part of Barros, Luana Machado, Soares, Matheus Mickael Mota, Freitas-Silva, Rafael Augusto Pinheiro De, Sinclair, Bradley J. & Ale-Rocha, Rosaly, 2022, Revision of the New Zealand endemic genus Pseudoscelolabes Collin (Diptera: Hybotidae: Ocydromiinae), pp.
Barros, Luana Machado +4 more
openaire +4 more sources
Shock and Vibration, Volume 2021, Issue 1, 2021., 2021 Distributed‐drive electric vehicles constitute an important research direction for the future development of electric vehicles. In this regard, the integrated suspension wheel‐side drive system has considerable development potential because it can address the lack of driving smoothness and the grounding deterioration caused by the excessive unsprung ...
Wen Lu +3 more
wiley +1 more source
A New Class of Contact Pseudo Framed Manifolds with Applications
International Journal of Mathematics and Mathematical Sciences, Volume 2021, Issue 1, 2021., 2021 In this paper, we introduce a new class of contact pseudo framed (CPF)‐manifolds (M, g, f, λ, ξ) by a real tensor field f of type (1,1), a real function λ such that f3 = λ2f where ξ is its characteristic vector field. We prove in our main Theorem 2 that M admits a closed 2‐form Ω if λ is constant.
K. L. Duggal, Luca Vitagliano
wiley +1 more source
On Distance in Some Finite Planes and Graphs Arising from Those Planes
Journal of Mathematics, Volume 2021, Issue 1, 2021., 2021 In this paper, affine and projective graphs are obtained from affine and projective planes of order pr by accepting a line as a path. Some properties of these affine and projective graphs are investigated. Moreover, a definition of distance is given in the affine and projective planes of order pr and, with the help of this distance definition, the ...
I. Dogan, A. Akpinar, Ahmet Sinan Cevik
wiley +1 more source
Certain Class of Almost α‐Cosymplectic Manifolds
Journal of Mathematics, Volume 2021, Issue 1, 2021., 2021 This paper concerned with almost α‐cosymplectic manifolds satisfying conformally flat condition. Firstly, we investigate Kaehler integral submanifolds of almost α‐cosymplectic manifolds. Next, we study conformally flat almost α‐cosymplectic manifolds of dim ≥ 5 whose integral submanifolds are Kaehler.
Sermin Öztürk +2 more
wiley +1 more source
Ricci Collineations for Non-Degenerate, Diagonal and Spherically Symmetric Ricci Tensors [PDF]
, 1999 The expression of the vector field generator of a Ricci Collineation for diagonal, spherically symmetric and non-degenerate Ricci tensors is obtained.
A. H. Bokhari +11 more
core +2 more sources
Classification of Spherically Symmetric Static Spacetimes according to their Matter Collineations [PDF]
, 2003 The spherically symmetric static spacetimes are classified according to their matter collineations. These are studied when the energy-momentum tensor is degenerate and also when it is non-degenerate.
A. A. Coley +19 more
core +2 more sources