Results 201 to 210 of about 636 (237)

Multi-scale curvature for automated identification of glaciated mountain landscapes.

Geomorphology (Amst), 2014
Prasicek G, Otto JC, Montgomery DR, Schrott L.   +3 more
europepmc   +1 more source

Towards a unified linear kinetic transport model with the trace ion module for EIRENE.

Comput Phys Commun, 2012
Seebacher J, Kendl A.
europepmc   +1 more source

Extended generalized quadrangles

Geometriae Dedicata, 1990
Extended generalized quadrangles (roughly, connected structures whose every residue is a generalized quadrangle) are studied in some detail, especially those which are uniform or strongly uniform. Much basic structure theory is developed, many examples are given, and something approaching characterization is given for many types.
CAMERON P., HUGHES D., PASINI A.
core   +4 more sources

Local Sharply Transitive Actions on Finite Generalized Quadrangles

Annals of Combinatorics, 2011
We classify the finite generalized quadrangles containing a line L such that some group of collineations acts sharply transitively on the ordered pentagons which start with two points of L. This can be seen as a generalization of a result of Thas and the
Theo Grundhöfer, Hendrik Van Maldeghem, Van Maldeghem Hendrik   +2 more
exaly   +2 more sources

Subquadrangles of Generalized Quadrangles of Order (q2, q), q Even

Journal of Combinatorial Theory - Series A, 2001
First, we survey the known generalized quadrangles of order (q2, q), q even, including a description of their known subquadrangles of order q. Then, in the case of Tits' generalized quadrangles, we completely classify the subquadrangles of order q, while
Christine M O'Keefe, Tim Penttila
exaly   +2 more sources

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Symmetry in Generalized Quadrangles

Designs, Codes and Cryptography, 2003
In this paper some new points of view about Lenz(-Barlotti)-type classification of finite generalized quadrangles are described. Also, it is shown that each span-symmetric generalized quadrangle of order \(s>1\) with \(s\) even is isomorphic to \(Q(4,5)\) without using the canonical connection between groups of order \(s^3-s\) with a 4-gonal basis and ...
openaire   +1 more source

Groups of Projectivities of Generalized Quadrangles

Geometriae Dedicata, 1998
For some reason the study of groups of projectivities of generalized quadrangles did not yet receive the attention due, although the study of groups of projectivities of projective planes produced a number of remarkable classification results. This paper rights this wrong.
Brouns, Leen, Tent, Katrin, Van Maldeghem, Hendrik   +2 more
openaire   +2 more sources

Characterizations of Translation Generalized Quadrangles

Designs, Codes and Cryptography, 2001
If \(x\) is a regular point of the generalized quadrangle \({\mathcal S}\) of order \((s,t)\), \(s\neq 1\neq t\), then \(x\) defines a dual net \({\mathcal N}^*_x\). In this paper a particular class of collineations, called transvections with axis \(x\), of the point-line dual of \({\mathcal N}^*_x\), has been introduced. If \({\mathcal S}\) contains a
openaire   +2 more sources

Generalized Quadrangles with an Abelian Singer Group

Designs, Codes and Cryptography, 2006
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Stefaan De Winter, Koen Thas
openaire   +2 more sources

Affine Generalized Quadrangles – An Axiomatization

Geometriae Dedicata, 2001
A geometric hyperplane of a generalized quadrangle \({\mathcal S} = (P,{\mathcal L})\) (with pointset \(\mathcal P\) and lineset \(\mathcal L\)) is a proper subset \(H\) of \(\mathcal S\) such that for every line \(l\in\mathcal L\) either \(l\subseteq H\) or \(l\) meets \(H\) in a single point. The author shows that if \(H\) is a (geometric) hyperplane
openaire   +1 more source