Results 61 to 70 of about 4,477 (212)

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, Khan, Suhail, Mahmood, Amjad   +2 more
core   +1 more source

Geometrical characterization of semilinear isomorphisms of vector spaces and semilinear homeomorphisms of normed spaces [PDF]

, 2013
Let $V$ and $V'$ be vector spaces over division rings (possible infinite-dimensional) and let ${\mathcal P}(V)$ and ${\mathcal P}(V')$ be the associated projective spaces.
Pankov, Mark
core  

Treacher collins syndrome

British Journal of Plastic Surgery, 1950
Summary Two cases of Treacher Collins syndrome are reported. The family history is shown to be variable, but there appears to be a distinct familial incidence. A comparison has been drawn between the Treacher Collins syndrome and unilateral facial agenesis. The embryology is discussed, and it has been suggested that the causative factor may influence
openaire   +2 more sources

VISUAL FEEDBACK IN PROBLEMS OF MOVING OBJECTS CONTROL

Міжнародний науково-технічний журнал "Проблеми керування та інформатики", 2006
Possibility of using planar collineation parameters for forming control actions in visual control systems of moving objects is studied. Through examples of solving problems of attitude control, translation motion control and stabilization of screw ...
D.V. Lebedev
doaj  

On Deriving Space-Time From Quantum Observables and States

, 2003
We prove that, under suitable assumptions, operationally motivated data completely determine a space-time in which the quantum systems can be interpreted as evolving. At the same time, the dynamics of the quantum system is also determined.
Summers, S. J., White, R. K.
core   +1 more source

On the symmetric block design with parameters (153, 57, 21)

Le Matematiche, 2009
In this paper it is proved that:A) Up to isomorphism and duality there are exactly two possible orbital structures for a putative symmetric block design with parameters (153, 57, 21) constructed using the Frobenius group F_{17·16}B) Up to isomorphism and
Rexhep Gjergji
doaj  

Distributed three-dimensional affine formation maneuver control for multiple autonomous underwater vehicles

Zhongguo Jianchuan Yanjiu
ObjectivesTo improve the ability of autonomous underwater vehicle (AUV) formations to perform tasks in complex obstacle scenarios, a distributed three-dimensional affine formation shape maneuver control method is proposed for multi-AUV formations ...
Mingqi YAO, Lin YU, Kai GUO, Yu LU, Lei QIAO   +4 more
doaj   +1 more source

Semiconformal symmetry- A new symmetry of the spacetime manifold of the general relativity

, 2019
In this paper we have introduced a new symmetry property of spacetime which is named as semiconformal curvature collineation, and its relationship with other known symmetry properties has been established.
Ahsan, Zafar, Ali, Musavvir, Pundeer, Naeem Ahmad   +2 more
core  

Nilpotent Singer groups [PDF]

, 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

Notes on Cooperstein Ovoids in Finite Geometries of Type 𝖤_6,1

Mathematics
A Cooperstein ovoid is a set of q8+q4+1 pairwise non-collinear points in the Lie incidence geometry E6,1(q). They were introduced by Cooperstein twenty-six years ago, motivated by the fact that possible non-existence of them would imply non-existence of ...
Hendrik Van Maldeghem
doaj   +1 more source