Results 21 to 30 of about 2,675 (232)

Certain Class of Almost α‐Cosymplectic Manifolds

open access: yesJournal 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

A Full List of Projectively Distinct K-Arcs in Finite Projetive Space Pg(2,8) [PDF]

open access: yesAl-Rafidain Journal of Computer Sciences and Mathematics, 2012
A k-arc in a plane PG(2,q)  is a set of k point such that every line in the plane intersect it in at most two points and there is a line intersect it in exactly two points. A k-arc is complete if there is no k+1-arc containing it.
Ali A. Abdulla, Abdulkhalik Yasin
doaj   +1 more source

ON THE DEFINITION OF MATTER COLLINEATIONS [PDF]

open access: yesModern Physics Letters A, 2009
It is shown that when the stress–energy tensor of a spacetime is diagonal and is written in the mixed form, its collineations admit infinite dimensional Lie algebras except possibly in the case when the tensor depends on all the spacetime coordinates. The result can be extended for more general second rank tensors.
Asghar Qadir, Khalid Saifullah
openaire   +3 more sources

Cubic Extensions of Flag-Transitive Planes, I. Even Order

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2001
The collineation groups of even order translation planes which are cubic extensions of flag-transitive planes are determined.
Yutaka Hiramine   +2 more
doaj   +1 more source

On rank 5 projective planes

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1984
In this paper we continue the study of projective planes which admit collineation groups of low rank (Kallaher [1] and Bachmann [2,3]). A rank 5 collineation group of a projective plane ℙ of order n≠3 is proved to be flag-transitive. As in the rank 3 and
Otto Bachmann
doaj   +1 more source

On singular projective deformations of two second class totally focal pseudocongruences of planes

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1988
Let C:L→L¯ be a projective deformation of the second order of two totally focal pseudocongruences L and L¯ of (m−1)-planes in projective spaces Pn and P¯n, 2m−1 ...
Ludmila Goldberg
doaj   +1 more source

Some geometric aspects of finite abelian groups [PDF]

open access: yesRendiconti di Matematica e delle Sue Applicazioni, 2006
Let Π be a finite projective plane admitting a large abelian collineation group. It is well known that this situation may be studied by algebraic means (via a representation by suitable types of difference sets), namely using group rings and algebraic ...
Dina Ghinelli, Dieter Jungnickel
doaj  

m-Parallelisms

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2002
Generalizations of the Johnson parallelisms are given using an index m subgroup of a Pappian central collineation group. The parallelisms, called m-parallelisms, are constructed and the isomorphisms classes are discussed.
Norman L. Johnson, Rolando Pomareda
doaj   +1 more source

Approximate Lie Symmetry Conditions of Autoparallels and Geodesics

open access: yesAbstract and Applied Analysis, Volume 2020, Issue 1, 2020., 2020
This paper is devoted to the study of approximate Lie point symmetries of general autoparallel systems. The significance of such systems is that they characterize the equations of motion of a Riemannian space under an affine parametrization. In particular, we formulate the first‐order symmetry determining equations based on geometric requirements and ...
Sameerah Jamal, Shi Liang Wu
wiley   +1 more source

Translation planes of odd order and odd dimension

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1979
The author considers one of the main problems in finite translation planes to be the identification of the abstract groups which can act as collineation groups and how those groups can act.
T. G. Ostrom
doaj   +1 more source

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