Results 91 to 100 of about 793 (200)

On the fixed point of a collineation of the real projective plane

, 2007
Using the "extended Euclidean plane" model we prove the existence of the fixed point of a collineation of the real projective plane. At first we obtain the collineation as a product of a reflection in a line, a reflection in a point and a central-axial ...
Krisztin Német, István
core  

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 THE STRUCTURE OF COLLINEATION GROUPS OF FINITE PROJECTIVE PLANES

, 1973
The study of a collineation group F of a finite projective plane SP splits into two parts: the determination first of the abstract structure of F, and then of the manner in which F acts on 3P.
M. Kantorf
core  

Proof of the prime power conjecture for projective planes of order $n$ with Abelian collineation groups of order $n^2$

, 2002
Let be an abelian collineation group of order of a projective plane of order . We show that must be a prime power, and that the -rank of is at least if for an odd prime
Schmidt, B., Jungnickel, D., Blokhuis, A.   +2 more
core   +1 more source

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

Synthese, 2021
Eder G.
europepmc   +1 more source

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

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

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  

Finite Projective Planes that Admit a Strongly Irreducible Collineation Group

, 1985
This paper studies how coding theory and group theory can be used to produce information about a finite projective plane π and a collineation group G of π.A new proof for Hering's bound on |G| is given in 2.5. Using the idea of coding theory developed in
Chat Yin Ho
core   +1 more source

A super pan-genomic landscape of rice. [PDF]

Cell Res, 2022
Shang L, Li X, He H, Yuan Q, Song Y, Wei Z, Lin H, Hu M, Zhao F, Zhang C, Li Y, Gao H, Wang T, Liu X, Zhang H, Zhang Y, Cao S, Yu X, Zhang B, Zhang Y, Tan Y, Qin M, Ai C, Yang Y, Zhang B, Hu Z, Wang H, Lv Y, Wang Y, Ma J, Wang Q, Lu H, Wu Z, Liu S, Sun Z, Zhang H, Guo L, Li Z, Zhou Y, Li J, Zhu Z, Xiong G, Ruan J, Qian Q.   +43 more
europepmc   +1 more source