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Search Results: 1 - 10 of 675850 matches for " María Inés Platzeck "
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A note on the spectral properties of cluster algebras
Elsa Fernández,María Inés Platzeck
Mathematics , 2010,
Abstract: Let $Q$ be a finite quiver without oriented cycles and $k$ an algebraically closed field.In this paper we establish a connection between cluster algebras and the representation theory of the path algebra $kQ$, in terms of the spectral properties of the quivers mutation equivalent to $Q$.
Idempotent ideals and the Igusa-Todorov functions
Andrea Gatica,Marcelo Lanzilotta,María Inés Platzeck
Mathematics , 2015,
Abstract: Let $\Lambda$ be an artin algebra and $\mathfrak{A}$ a two-sided idempotent ideal of $\Lambda$, that is, $\mathfrak{A}$ is the trace of a projective $\Lambda$-module $P$ in $\Lambda$. We consider the categories of finitely generated modules over the associated rings $\Lambda/\mathfrak{A}, \Lambda$ and $\Gamma=\mathrm{End}_{\Lambda}(P)^{op}$ and study the relationship between their homological properties via the Igusa-Todorov functions.
The left part and the Auslander-Reiten components of an artin algebra
Assem,Ibrahim; Cappa,Juan ángel; Platzeck,María Inés; Trepode,Sonia;
Revista de la Uni?3n Matem??tica Argentina , 2005,
Abstract: the left part of the module category of an artin algebra consists of all indecomposables whose predecessors have projective dimension at most one. in this paper, we study the auslander-reiten components of (and of its left support ) which intersect and also the class of the indecomposable ext-injectives in the addditive subcategory add generated by .
From iterated tilted algebras to cluster-tilted algebras
Michael Barot,Elsa Fernández,María Inés Platzeck,Nilda Isabel Pratti,Sonia Trepode
Mathematics , 2008,
Abstract: In this paper the relationship between iterated tilted algebras and cluster-tilted algebras and relation-extensions is studied. In the Dynkin case, it is shown that the relationship is very strong and combinatorial.
On the existence and construction of proper costratifying systems
Octavio Mendoza,Maria Inés Platzeck,Melina Verdecchia
Mathematics , 2011,
Abstract: In this paper we further study the notion of proper costratifying systems, defined in \cite{MPV}. We give sufficient conditions for their existence, and investigate the relation between the stratifying systems defined by K. Erdmann and C. S\'aenz in \cite{ES} with the proper costratifying systems.
Fundamental domains of cluster categories inside module categories
Juan ángel Cappa,Maria Inés Platzeck,Idun Reiten
Mathematics , 2011,
Abstract: Let $H$ be a finite dimensional hereditary algebra over an algebraically closed field, and let $\mathcal{C}_{H}$ be the corresponding cluster category. We give a description of the (standard) fundamental domain of $\mathcal{C}_{H} $ in the bounded derived category $\mathcal{D}^{b}(H)$, and of the cluster-tilting objects, in terms of the category $\mod\Gamma $\ of finitely generated modules over a suitable tilted algebra $% \Gamma .$ Furthermore, we apply this description to obtain (the quiver of) an arbitrary cluster-tilted algebra.
The critical role of volcano monitoring in risk reduction
A. Mahmood, E. Cubero-Castan, G. Platzeck,J. Bequignon
Advances in Geosciences (ADGEO) , 2008,
Abstract: The International Charter "Space and Major Disasters" is about joint operations and tasking of imaging satellites and other space resources of the member space agencies and operators in the delivery of information products to assist in responding to disasters of natural and technological causes. Authorized Users, who are the civil protection, emergency response or similar organizations of a state that is member of the Charter, can request the data and products. A specialist, called the Project Manager (PM), manages the overall data acquisition and delivery process. Regional initiatives, as for the Latin American countries, are under way to involve PMs from non-member states to have access to satellite data and apply these to disaster coverage in their respective regions. Volcanic eruptions are typical examples of disasters that affect the Latin American countries. A few Charter activations on this disaster type are described to highlight the information products provided under the Charter.
Larval habitat of Ochlerotatus albifasciatus (Diptera: Culicidae) in the southern edge of the Americas, Tierra del Fuego Island  [PDF]
Nora Edith Burroni, María Verónica Loetti, María Cristina Marinone, María Gabriela Freire, Nicolás Schweigmann
Open Journal of Animal Sciences (OJAS) , 2013, DOI: 10.4236/ojas.2013.34A1002
Abstract: The information about ecological topics of mosquitoes at the southernmost tip of South America is fragmentary and scarce. The present study evaluates lentic freshwater habitat located in the surroundings of main roads of the Argentine sector of Tierra del Fuego as larval habitat of Ochlerotatus albifasciatus, also analyzes the relationships between their presence and several environmental variables: water turbidity, percentage of gramineans, percentage of macrophytes, presence of crustaceous cyanobacteria, and filamentous chlorophyceans. Mosquito inmatures were collected with dip nets. A generalized linear model (GLM) with negative binomial error distribution was used to determine the effects of different variables of the water bodies on abundance of Oc. albifasciatus in the larval habitats. Collections were made in 45 lentic freshwater bodies. Preimaginal stages were found in 17.70% of the studied habitats. Oc. albifasciatus was the only culicid registered. The GLM explained 93.17% of the variability, and showed a negative relationship between the abundances of Oc. albifasciatus and water turbidity, and a positive relationship with percent-age of gramineans. The gramineans would improve food supply, because the plants are providing suitable substrate for different types of microbiota, a layer of leaves would protect eggs from extreme temperatures, and could help the larvae to hide from potential predators. The negative association between abundance of this species with water turbidity could be related to the presence of vegetation that favors retaining the substrate, reducing water turbidity.
On Complete Bicubic Fractal Splines  [PDF]
Arya Kumar Bedabrata Chand, María A. Navascués
Applied Mathematics (AM) , 2010, DOI: 10.4236/am.2010.13024
Abstract: Fractal geometry provides a new insight to the approximation and modelling of experimental data. We give the construction of complete cubic fractal splines from a suitable basis and their error bounds with the original function. These univariate properties are then used to investigate complete bicubic fractal splines over a rectangle Bicubic fractal splines are invariant in all scales and they generalize classical bicubic splines. Finally, for an original function , upper bounds of the error for the complete bicubic fractal splines and derivatives are deduced. The effect of equal and non-equal scaling vectors on complete bicubic fractal splines were illustrated with suitably chosen examples.
Ecos recientes de un debate inconcluso acerca de la Revolución Agrícola en Inglaterra y de la transformación de su economía agraria entre 1500 y 1850
Carzolio,María Inés;
Mundo agrario , 2006,
Abstract: the debate about the existence, chronology and factors of an "agricultural revolution" that proceed and its related to the "industrial revolution" has a long history. the substantive topics of this debate keep a central importance to comprehend the development of the agriculture as much as the english economy between 1500th and 1850th centuries. in this time it has been configured a traditional version and a revisionist version. its possible at this length to made a confrontation of both interpretations using the work of two mayor authors: marc overton and robert c. allan.
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