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Search Results: 1 - 10 of 13760 matches for " Marcelo;Muniz "
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A standard form for generator matrices with respect to the Niederreiter-Rosenbloom-Tsfasman metric
Marcelo Muniz S. Alves
Mathematics , 2011,
Abstract: In this note, we present an analogue for codes in vector spaces with a Rosenbloom-Tsfasman metric of the well-known standard form of generator matrices for codes in spaces with the Hamming metric.
O planejamento na educa o física escolar: um possível caminho para a forma o do novo homem Planning for physical education in schools: A possible path for the education of a new human being El planeamiento de la educación física de la escuela: Una manera posible para la formación de un nuevo hombre
Marcelo Nunes Say?o,Neyse Luiz Muniz
Pensar a Prática , 2006, DOI: 19806183/rpp.v7i2.95
Abstract: Este texto procura apontar para a importancia de se construir um planejamento baseado numa referência de sociedade e de homem. A partir daí, apresenta um exemplo de planejamento para a educa o física escolar baseado em uma concep o de sociedade e de homem. PALAVRAS-CHAVE: planejamento – educa o física escolar. This text aims at pointing at the importance of plan-making based on a reference of society and of humankind. From this starting point it presents a model of planning for physical education in schools based on a concept of society and of human beings. KEY-WORD: planning – physical education in schools Este texto procura se alar la importancia de construirse una planificación basada en una referencia de sociedad y de hombre. A partir de ello presenta un ejemplo de planificación para la educación física escolar basado en una concepción desociedad y de hombre. PALABRAS-CLAVE: planificación – educación física escolar.
Indústria de constru o naval: percep o de risco nas opera es de financiamento no Brasil
Marcello Muniz Silva,Marcelo Ramos Martins
Revista de Finan?as Aplicadas , 2010,
Abstract: Esse artigo avalia as condi es empresariais de capta o e a percep o de riscos das opera es de financiamento de projetos de constru o naval no Brasil. Ao fazer isso, discute o problema do financiamento setorial por meio da (i) análise estatística de indicadores econ mico-financeiros (IEF) obtidos a partir de Demonstra es Financeiras de amostras n o intencionais de empresas de transporte e apoio marítimo (nacionais e estrangeiras) e da (ii) percep o de diferentes atores ligados ao setor (armadores, estaleiros, agentes financeiros, membros de entidades classistas, etc.). Os procedimentos metodológicos adotados se baseiam, respectivamente, em testes estatísticos de diferen a de médias de IEF e em entrevistas feitas com atores das diversas contrapartes envolvidas nas opera es. Por meio do confronto entre essas procedimentos, os resultados apontam que n o há diferen as pronunciadas na estrutura financeira entre amostras n o intencionais de empresas nacionais e estrangeiras e que há fortes divergências nas opini es expressas em torno dos riscos associados ao financiamento. Isso sugere que a base de negocia o é precária conduzindo, frequentemente, a impasses na transferência de ativos para o financiamento à constru o naval remetendo a quest o das garantias de crédito.
The Symmetries of the $π$-metric
Marcelo Muniz S. Alves,Luciano Panek
Mathematics , 2009,
Abstract: Let V be an n-dimensional vector space over a finite field F_q. We consider on V the $\pi$-metric recently introduced by K. Feng, L. Xu and F. J. Hickernell. In this short note we give a complete description of the group of symmetries of V under the $\pi$-metric.
Enveloping Actions for Partial Hopf Actions
Marcelo Muniz S. Alves,Eliezer Batista
Mathematics , 2008,
Abstract: Motivated by partial group actions on unital algebras, in this article we extend many results obtained by Exel and Dokuchaev to the context of partial actions of Hopf algebras, according to Caenepeel and Jansen. First, we generalize the theorem about the existence of an enveloping action, also known as the globalization theorem. Second, we construct a Morita context between the partial smash product and the smash product related to the enveloping action. Third, we dualize the globalization theorem to partial coactions and finally, we define partial representations of Hopf algebras and show some results relating partial actions and partial representations.
Partial Hopf actions, partial invariants and a Morita context
Marcelo Muniz S. Alves,Eliezer Batista
Mathematics , 2009,
Abstract: Partial actions of Hopf algebras can be considered as a generalization of partial actions of groups on algebras. Among important properties of partial Hopf actions, it is possible to assure the existence of enveloping actions. This allows to extend several results from the theory of partial group actions to the Hopf algebraic setting. In this article, we explore some properties of the fixed point subalgebra with relations to a partial action of a Hopf algebra. We also construct, for partial actions of finite dimensional Hopf algebras a Morita context relating the fixed point subalgebra and the partial smash product. This is a generalization of a well known result in the theory of Hopf algebras for the case of partial actions. Finally, we study Hopf-Galois extensions and reobtain some classical results in the partial case.
Globalization theorems for partial Hopf (co)actions, and some of their applications
Marcelo Muniz S. Alves,Eliezer Batista
Mathematics , 2010,
Abstract: Partial actions of Hopf algebras can be considered as a generalization of partial actions of groups on algebras. Among important properties of partial Hopf actions, it is possible to prove the existence of enveloping actions, i.e., every partial Hopf action on a algebra A is induced by a Hopf action on a algebra B that contains A as a right ideal. This globalization theorem allows to extend several results from the theory of partial group actions to the Hopf algebraic setting. In this article, we prove a dual version of the globalization theorem: that every partial coaction of a Hopf algebra admits an enveloping coaction. We also show how this works on a series of examples which go beyond partial group actions. Finally, we explore some consequences of globalization theorems in order to present versions of the duality theorems of Cohen-Montgomery and Blattner-Montgomery for partial Hopf actions.
Partial Representations of Hopf Algebras
Marcelo Muniz S. Alves,Eliezer Batista,Joost Vercruysse
Mathematics , 2013,
Abstract: In this work, the notion of partial representation of a Hopf algebra is introduced and its relationship with partial actions of Hopf algebras is explored. Given a Hopf algebra $H$, one can associate it to a Hopf algebroid $H_{par}$ which has the universal property that each partial representation of $H$ can be factorized by an algebra morphism from $H_{par}$. We define also the category of partial modules over a Hopf algebra $H$, which is the category of modules over its associated Hopf algebroid $H_{par}$. The Hopf algebroid structure of $H_{par}$ enables us to enhance the category of partial $H$ modules with a monoidal structure and such that the algebra objects in this category are the usual partial actions. Some examples of categories of partial $H$ modules are explored. In particular we can describe fully the category of partially $\mathbb{Z}_2$-graded modules.
On cyclotomic cosets and code constructions
Giuliano Gadioli La Guardia,Marcelo Muniz Silva Alves
Mathematics , 2015,
Abstract: New properties of $q$-ary cyclotomic cosets modulo $n = q^{m} - 1$, where $q \geq 3$ is a prime power, are investigated in this paper. Based on these properties, the dimension as well as bounds for the designed distance of some families of classical cyclic codes can be computed. As an application, new families of nonbinary Calderbank-Shor-Steane (CSS) quantum codes as well as new families of convolutional codes are constructed in this work. These new CSS codes have parameters better than the ones available in the literature. The convolutional codes constructed here have free distance greater than the ones available in the literature.
Twisted partial actions of Hopf algebras
Marcelo Muniz S. Alves,Eliezer Batista,Michael Dokuchaev,Antonio Paques
Mathematics , 2011, DOI: 10.1007/s11856-013-0032-9
Abstract: In this work, the notion of a twisted partial Hopf action is introduced as a unified approach for twisted partial group actions, partial Hopf actions and twisted actions of Hopf algebras. The conditions on partial cocycles are established in order to construct partial crossed products, which are also related to partially cleft extensions of algebras. Examples are elaborated using algebraic groups.
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