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Browsing Matemáticas by Submit Date

Browsing Matemáticas by Submit Date

Now showing items 1-20 of 184

Fitting Ranked Linguistic Data with Two-Parameter Functions

Li, WT; Miramontes, P; Cocho, G (2010)

It is well known that many ranked linguistic data can fit well with one-parameter models such as Zipf's law for ranked word frequencies. However, in cases where discrepancies from the one-parameter model occur (these will ...
PROPER ACTIONS ON TOPOLOGICAL GROUPS: APPLICATIONS TO QUOTIENT SPACES

Antonyan, SA (2010)

Let X be a Hausdorff topological group and G a locally compact subgroup of X. We show that the natural action of G on X is proper in the sense of R. Palais. This is applied to prove that there exists a closed set F subset ...
The number of (C-3)over right arrow-free vertices on 3-partite tournaments

Figueroa, AP; Llano, B; Zuazua, RE (2010)

Let T be a 3-partite tournament. We say that a vertex u is (C-3) over right arrow -free if v does not lie on any directed triangle of T. Let F-3 (T) be the set of the (C-3) over right arrow -free vertices in a 3-partite ...
Modelling the dynamics of dengue real epidemics

Pinho, STR; Ferreira, CP; Esteva, L; Barreto, FR; Silva, VCME; Teixeira, MGL (2010)

In this work, we use a mathematical model for dengue transmission with the aim of analysing and comparing two dengue epidemics that occurred in Salvador, Brazil, in 1995-1996 and 2002. Using real data, we obtain the force ...
DIAGRAMS IN CATEGORIES OF PARTIAL LINEAR SPACES OF ORDER TWO

Cardenas, H; Lluis, E; Raggi-Cardenas, AG; Agustin, RS (2010)

In this note we define, using a universal property, the concept of diagram for a space in categories of not necessarily finite partial linear spaces of order two and prove that in the category of symplectic-type spaces all ...
On the Relative Socle for Stratifying Systems

Lanzilotta, M; Marcos, E; Mendoza, O; Saenz, C (2010)

Let A be a finite dimensional k-algebra, (, ) be a stratifying system in mod(A) and F() be the class of -filtered A-modules. In this article, we give the definition and also study some of the properties of the relative ...
BASIC PRERADICALS AND MAIN INJECTIVE MODULES

Raggi, F; Ríos, J; Rincon, H; Fernandez-Alonso, R (2009)

We consider those injective modules that determine every left exact preradical and we call them main injective modules. We construct a main injective module for every ring and we prove some of its properties. In particular ...
Cheeger's constant in balls and isoperimetric inequality on Riemannian manifolds

Unknown author (2008)

We prove isoperimetric inequality on a Riemannian manifold, assuming that the Cheeger constant for balls satisfies a certain estimation.
Proper actions of locally compact groups on equivariant absolute extensors

Antonyan, SA (2009)

Let G be a locally compact Hausdorff group. We study equivariant absolute (neighborhood) extensors (G-AE's and G-ANE's) in the category G-M of all proper G-spaces that are metrizable by a G-invariant metric. We first solve ...
Seasonality and Outbreaks in West Nile Virus Infection

Cruz-Pacheco, G; Esteva, L; Vargas, C (2009)

In this paper we analyze the impact of seasonal variations on the dynamics of West Nile Virus infection. We are interested in the generation of new epidemic peaks starting from an endemic state. In many cases, the oscillations ...
ITERATED TUBULAR ALGEBRAS

DELAPENA, JA; Tomé, BM (1990)
NOETHERIAN REFINABILITY IN GENERALIZED ORDERED SPACES AND STRONGLY INACCESSIBLE CARDINALS

Tamariz, A (1990)
Modelling parasitism and predation of mosquitoes by water mites

Esteva, L; Rivas, G; Yang, HM (2006)

Parasitism and predation are two ecological interactions that can occur simultaneously between two species. This is the case of Culicidae (Insecta: Diptera) and water mites (Acari: Hydrachnidia). The larva mites are parasites ...
HOMOLOGICAL SYSTEMS IN MODULE CATEGORIES OVER PRE-ORDERED SETS

Mendoza, O; Saenz, C; Xi, CC (2009)

We introduce the so-called homological systems in a module category over a pre-ordered set, which generalize the notion of a stratifying system over a linearly ordered set, and study both the corresponding modules filtrated ...
ASSESSING THE SUITABILITY OF STERILE INSECT TECHNIQUE APPLIED TO AEDES AEGYPTI

Ferreira, CP; Yang, HM; Esteva, L (2008)

The efficacy of biological control of Aedes aegypti mosquitoes using Sterile Insect Technique (SIT) is analyzed. This approach has shown to be very efficient on agricultural plagues and has become an alternative control ...
Asymptotics for supersonic soliton propagation in the Toda lattice equation

Unknown author (2008)

We study the problem of the adjustment of an initial condition to an exact supersonic soliton solution of the Toda latice equation. Also, we study the problem of soliton propagation in the Toda lattice with slowly varying ...
Asymptotics for supersonic soliton propagation in the Toda lattice equation

Unknown author (2008)

We study the problem of the adjustment of an initial condition to an exact supersonic soliton solution of the Toda latice equation. Also, we study the problem of soliton propagation in the Toda lattice with slowly varying ...
Asymptotics for supersonic soliton propagation in the Toda lattice equation

Unknown author (2008)

We study the problem of the adjustment of an initial condition to an exact supersonic soliton solution of the Toda latice equation. Also, we study the problem of soliton propagation in the Toda lattice with slowly varying ...
Spatio-temporal dynamics of a three interacting species mathematical model inspired in physics

Brena-Medina, VE; Sánchez-Garduno, F (2008)

In this paper we study both, analytically and numerically, the spatio-temporal dynamics of a three interacting species mathematical model. The populations take the form of pollinators, a plant and herbivores
G-ANR's with homotopy trivial fixed point sets

Antonyan, SA (2007)

Let G be a compact group and X a G-ANR. Then X is a G-AR iff the H-fixed point set X-H is homotopy trivial for each closed subgroup H subset of G.

Now showing items 1-20 of 184

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