Metric Spaces
Mostrando 13-24 de 25 artigos, teses e dissertações.
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13. Static two-player evasion-interrogation games with uncertainty
We consider electromagnetic evasion-interrogation games wherein the evader can use ferroelectric material coatings to attempt to avoid detection while the interrogator can manipulate the interrogating frequencies (wave numbers) and angles of incidence of the interrogating inputs to enhance detection and identification. The resulting problems are formulated a
Computational & Applied Mathematics. Publicado em: 2006
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14. The reconstruction of color spaces: type 2 diabetes and mercury vapour intoxication / Reconstrução do espaço de cores de pacientes com discromatopsia adquirida: diabéticos tipo 2 e intoxicados por vapor de mercúrio
Purpose. Color vision was examined in two groups of patients, one group with diabetes mellitus type 2 (DM2) without retinopathy (n=32) and a second group with chronic exposure to mercury vapour (Hg) (n=18), as well as in the respective age-matched controls (n=23; n=18) in order to reconstruct their color spaces. We assessed the type and degree of distortions
Publicado em: 2006
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15. Metricas de Einstein em variedades bandeira / Einstein metrics on flag manifolds
The goal of this work is to contribute the study of invariant Hermitian geometry on flag manifolds. We study the class of Einstein metrics on flag manifolds. In this work we present new solutions for the invariant Einstein equation on flag manifolds, maximals or not, of Ai case. Let W a subgroup of the Weyl group. We described a natural action of W on the so
Publicado em: 2005
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16. Visualizing the organization and behavior of metric access methods: Applications in similarity queries / "Visualizando a organização e o comportamento de estruturas métricas: aplicações em consultas por similaridade"
The use of computers by an increasing variety of applications led the Database Management Systems (DBMS) to be used to store a wide range of complex data types, such as images, sounds, DNA chains, etc. Queries based on the total order relationship and/or equality can not be applied or have a limited range of applications when performed over these datasets. I
Publicado em: 2004
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17. THURSTON GEOMETRIES AND SEIFERT FIBER SPACES / GEOMETRIAS DE THURSTON E FIBRADOS DE SEIFERT
We begin by studying orbifolds, i.e., topological spaces locally homeomorphic to quotients of Rn by finite groups. Then we study Seifert fiber spaces of dimension three which are certain type of foliations by circles that can be seen as fiber bundles over orbifolds. This material is useful in the subsequent study of Thurston model geometries. A Thurston mode
Publicado em: 2003
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18. Topicos de aproximação em espaços normados
In this work we treat some topics of the Approximation Theory in the real normed spaces, such as the existence and uniqueness of the element of best approximation and the continuity of the metric projection. We present examples and counter-examples of sets of existence and Chebyshev sets. We also treat the problem of connectedness of Chebyshev sets in Hilber
Publicado em: 2002
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19. CONFORMAL GEOMETRY OF GENERALIZED METRIC SPACES
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20. From local to global in quasiconformal structures.
We exhibit a large class of metric spaces whose infinitesimal quasiconformal structure is strong enough to capture the global quasiconformal structure. A sufficient condition for this to happen is described in terms of a Poincaré-type inequality.
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21. The dimension of product spaces
The covering dimension of a product space can exceed the sum of the dimensions of its factors. A separable metric space X and a paracompact space Y are constructed such that dim X + dim Y = 0 < 1 = dim(X × Y). Related results are also discussed.
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22. Metric rigidity theorems on Hermitian locally symmetric spaces
Let X = Ω/Γ be a compact quotient of an irreducible bounded symmetric domain Ω of rank ≥2 by a discrete group ω of automorphisms without fixed points. It is well known that the Kähler-Einstein metric g on X carries seminegative curvature (in the sense of Griffiths). I show that any Hermitian metric h on X carrying seminegative curvature must be a cons
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23. Holomorphic Embedding of Complex Curves in Spaces of Constant Holomorphic Curvature
A special case of Wirtinger's theorem asserts that a complex curve (two-dimensional) holomorphically embedded in a Kaehler manifold is a minimal surface. The converse is not necessarily true. Guided by considerations from the theory of moduli of Riemann surfaces, we discover (among other results) sufficient topological and differential-geometric conditions f
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24. Connectivities Ri of Fréchet Spaces in Variational Topology
A global study of geodesics, joining points A1 [unk] A2 on a Riemannian manifold Nn, is oriented by the answers given to two questions. How does the concept of a nondegenerate geodesic enter, and what topological invariants best condition the geodesics joining A1 to A2? We answer the first question by defining and exploiting nondegenerate point pairs A1 [unk