Browsing Matemática by Type
Now showing items 1-7 of 7
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Clustering via ant colonies: Parameter analysis and improvement of the algorithm
(2020-04-18)An ant colony optimization approach for partitioning a set of objects is proposed. In order to minimize the intra-variance, or within sum-of-squares, of the partitioned classes, we construct ant-like solutions by a ... -
Drinking as an epidemic - a simple mathematical model with recovery and relapse
(2007)This chapter discusses a simple mathematical model of drinking lapse. Problem drinking is modeled as an acquired state - the result of frequent or intense interactions among individuals in three drinking states within a ... -
Hopf algebras in noncommutative geometry
(2003)We give an introductory survey to the use of Hopf algebras in several problems of noncommutative geometry. The main example, the Hopf algebra of rooted trees, is a graded, connected Hopf algebra arising from a universal ... -
Noncommutative geometry and quantization
(2000-06)We examine some recent developments in noncommutative geometry, including spin geometries on noncommutative tori and their quantization by the Shale-Stinespring procedure, as well as the emergence of Hopf algebras as a ... -
On the kinematics of the last Wigner particle
(2019)Wigner's particle classification provides for "continuous spin" representations of the Poincaré group, corresponding to a class of (as yet unobserved) massless particles. Rather than building their induced realizations by ... -
The interface of noncommutative geometry and physics
(2004-01)As a mathematical theory per se, noncommutative geometry (NCG) is by now well established. From the beginning, its progress has been crucially influenced by quantum physics: we briefly review this development in recent ... -
Virtual Coarse Spaces for Irregular Subdomain Decompositions
(2020-10-25)On the other hand, Virtual Element Methods (VEM) [1, 12, 13] allow to handle general polygonal elements. In the case of triangular elements, VEM reduces to the usual FEM. Thus, VEM is a natural choice for constructing space ...