Results 71 to 80 of about 844 (181)

Quasiregular collineation groups

, 1969
Gli autori studiano la struttura delle orbite dei gruppi di collineazioni quasiregolari dei piani grafici finiti. Si ottengono dei limiti per l'ordine del gruppo in relazione al numero delle rette e dei punti uniti e viene discussa la struttura delle ...
Ganley, Michael J., Piper, Fred C.
core  

A Characterization of the Hughes Planes

, 1965
Baer (1) introduced the term "(p,L)-collineation" to denote a central collineation with centre p and axis L. We shall find it convenient to use a modification of the related notion of "(p, L)-transitivity."Definition.
T. G. Ostrom
core   +1 more source

Insights into the phylogeny and chloroplast genome evolution of Eriocaulon (Eriocaulaceae). [PDF]

BMC Plant Biol, 2023
Li E, Liu K, Deng R, Gao Y, Liu X, Dong W, Zhang Z.   +6 more
europepmc   +1 more source

On Finite Collineation Groups of F₅

, 1969
Our aim in this paper is to fill one gap left in (1) and to prove that if H is a finite collineation group of F5, the free plane generated by a finite open configuration of rank 9, then |H | ≦ 12.
Reuben Sandler
core   +1 more source

On Finite Line Transitive Affine Planes Whose Collineation Groups Contain no Baer Involutions

, 1975
A finite line transitive affine planeAis a finite plane which admits a collineation groupGacting transitively on the set of all lines ofA. Wagner [11] has shown thatAis a translation plane and Hering [9] recently investigated the structure ofAunder the ...
Terry Czerwinski
core   +1 more source

Frege on intuition and objecthood in projective geometry. [PDF]

Synthese, 2021
Eder G.
europepmc   +1 more source

Matter and Ricci Collineations [PDF]

, 2013
The infinitesimal transformations that leave invariant a two-covariant symmetric tensor are studied. The interest of these symmetry transformations lays in the fact that this class of tensors includes the energy-momentum and Ricci tensors. We find that in most cases the class of infinitesimal generators of these transformations is a finite dimensional ...
openaire   +2 more sources

Constructions and Comparisons of Pooling Matrices for Pooled Testing of COVID-19. [PDF]

IEEE Trans Netw Sci Eng, 2022
Lin YJ, Yu CH, Liu TH, Chang CS, Chen WT.   +4 more
europepmc   +1 more source

Remarks on the concepts of affine transformation and collineation in teaching geometry in teachers’ training college [PDF]

In [11] and [12] (textbooks for teachers’ training colleges written by B. Pelle) isometry and similarity are defined not in the classical way but as a product.
Német, István Krisztin
core  

The Collineation Group of the Veblen-Wedderburn Plane of Order Nine

, 1970
In this paper we prove that the order of the collineation group of the Veblen-Wedderburn plane of order nine is 311,040. This result was stated by Hall [3] in 1943 and proved by Pierce [9] in 1964.
Frederick W. Stevenson
core   +1 more source