Results 11 to 20 of about 3,180,129 (338)

Matroid Enumeration for Incidence Geometry [PDF]

open access: yesDiscrete & Computational Geometry, 2011
Matroids are combinatorial abstractions for point configurations and hyperplane arrangements, which are fundamental objects in discrete geometry. Matroids merely encode incidence information of geometric configurations such as collinearity or coplanarity, but they are still enough to describe many problems in discrete geometry, which are called ...
David Bremner   +3 more
openaire   +2 more sources

High‐Fat and Low‐Carbohydrate Dietary Environments Are Linked to Reduced Idiopathic Epilepsy Incidence and Prevalence [PDF]

open access: yesAnnals of Clinical and Translational Neurology
Dietary manipulations like ketogenic diets are established interventions for recalcitrant epilepsy. However, it remains unknown whether specific macronutrient exposure through dietary environments could possibly extend to primary preventive qualities ...
Duan Ni   +4 more
doaj   +2 more sources

An axiom system for incidence spatial geometry

open access: greenRevista de la Real Academia de Ciencias Exactas, Fisicas y Naturales. Serie A. Matematicas, 2008
Incidence spatial geometry is based on three-sorted structures consisting of points, lines and planes together with three intersort binary relations between points and lines, lines and planes and points and planes. We introduce an equivalent one-sorted geometrical structure, called incidence spatial frame, which is suitable for modal considerations. We
Alfonso Ríder Moyano, Rafael M. Rubio
openalex   +4 more sources

An Incidence Geometry approach to Dictionary Learning [PDF]

open access: yes, 2015
We study the Dictionary Learning (aka Sparse Coding) problem of obtaining a sparse representation of data points, by learning \emph{dictionary vectors} upon which the data points can be written as sparse linear combinations.
Sitharam, Meera   +2 more
core   +2 more sources

Finite projective geometries that are incidence structures of caps

open access: bronzeLinear Algebra and its Applications, 1982
AbstractA t-cap in a geometry is a set of t points no three of which are collinear. A quadric in a projective geometry PG(n, q) is a set of points x which satisfy xTQx = 0,Q being an n + 1 by n + 1 matrix over GF(q). We show that in any Desarguesian projective geometry PG(2n, q), q odd, there exists a family of (q + 1)-caps which obey the axioms for ...
Barbu C. Kestenband
openalex   +3 more sources

The flecnode polynomial: a central object in incidence geometry [PDF]

open access: green, 2014
We give a brief exposition of the proof of the Cayley-Salmon theorem and its recent role in incidence geometry. Even when we don't use the properties of ruled surfaces explicitly, the regime in which we have interesting results in point-line incidence ...
Katz, Nets Hawk
core   +4 more sources

An incidence Hopf Algebra of Convex Geometries

open access: green, 2012
A lattice L is "meet-distributive" if for each element of L, the meets of the elements directly below it form a Boolean lattice. These objects are in bijection with "convex geometries", which are an abstract model of convexity. Do they give rise to an incidence Hopf algebra of convex geometries?
Fabian Latorre
openalex   +4 more sources

Parametric investigation of laser incidence geometry in laser-assisted milling of Inconel 718

open access: goldJournal of Materials Research and Technology
While laser-assisted milling machining is promising for promoting the machinability of Inconel 718, the geometrical parameters of laser beam relative to milling tool significantly influence its machining performance.
Chenwei Gao   +3 more
doaj   +2 more sources

Grazing exit versus grazing incidence geometry for x-ray absorption near edge structure analysis of arsenic traces [PDF]

open access: green, 2009
In the presented study the grazing exit x-ray fluorescence was tested for its applicability to x-ray absorption near edge structure analysis of arsenic in droplet samples.
Florian Meirer   +4 more
openalex   +2 more sources

FinInG: a package for Finite Incidence Geometry

open access: green, 2016
FinInG is a package for computation in Finite Incidence Geometry. It provides users with the basic tools to work in various areas of finite geometry from the realms of projective spaces to the flat lands of generalised polygons. The algebraic power of GAP is exploited, particularly in its facility with matrix and permutation groups.
John Bamberg   +5 more
openalex   +4 more sources

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