432 resultados para Jeltsch conjecture


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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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No levante paulista de 1932, o jornal O Estado de S. Paulo ocupou papel de destaque ao noticiar, com eloqüência, as informações da guerra que lhe convinha e, principalmente, participar das articulações que redundariam no entrincheiramento. Entretanto, a atuação do periódico na conjuntura não se resume à manipulação da notícia ou deriva meramente do projeto político de seus diretores. Na “Revolução Constitucionalista” O Estado de S. Paulo agiu como o porta-voz da elite paulista. Neste texto, portanto, pretendo problematizar a participação do jornal O Estado de S. Paulo no levante de 1932, enfatizando sua condição de fonte e objeto para a produção do conhecimento histórico.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Matemática em Rede Nacional - IBILCE

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There are several mechanical models to describe the DNA phenomenology. In this work the DNA denaturation is stu- died under thermodynamical and dynamical point of view using the well known Peyrard-Bishop model. The thermody-namics analysis using the transfer integral operator method is briefly reviewed. In particular, the lattice size is discussed and a conjecture about the minimum energy to denaturation is proposed. In terms of the dynamical aspects of the model, the equations of motion for the system are integrated and the results determine the energy density where the denatura- tion occurs. The behavior of the lattice near the phase transition is analyzed. The relation between the thermodynamical and dynamical results is discussed.

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We determine the relation amongst the global Lê cycles and the Milnor classes of analytic hypersurfaces defined by a section of a very ample line bundle over a compact complex manifold. The key point is finding appropriate expressions for the global Lê cycles and for the Milnor classes in terms of polar varieties. Our starting points are an interpretation of the Lê cycles given by T. Gaffney and R. Gassler, a formula by A. Parusinski and P. Pragacz for the Milnor classes via McPherson’s functor, and a conjecture of J.-P. Brasselet, that we prove, stating that Milnor classes can be expressed in terms of polar varieties. We then use the work by R. Piegne for Mather classes, by J. Schürmann and M. Tibăr for MacPherson’s classes for constructible functions, and by D. Massey for an extension of the local Lê cycles for constructible sheaves.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Using the pure spinor formalism, a quantizable sigma model has been constructed for the superstring in an AdS(5) X S-5 background with manifest PSU(2,2 vertical bar 4) invariance. The PSU(2,2 vertical bar 4) metric g(AB) has both vector components gab and spinor components g, 3, and in the limit where the spinor components g, 3 are taken to infinity, the AdS5 X S5 sigma model reduces to the worldsheet action in a flat background. In this paper, we instead consider the limit where the vector components g(ab) are taken to infinity. In this limit, the AdS5 X S5 sigma model simplifies to a topological A-model constructed from fermionic N=2 superfields whose bosonic components transform like twistor variables. Just as d=3 Chern-Simons theory can be described by the open string sector of a topological A-model, the open string sector of this topological A-model describes d=4 N=4 super-Yang-Mills. These results might be useful for constructing a worldsheet proof of the Maldacena conjecture analogous to the Gopakumar-Vafa-Ooguri worldsheet proof of Chern-Simons/conifold duality.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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This study had two objectives: to build theoretically the hypothetical landmarks of the environmental crisis and to conjecture new horizons or utopias which can fulfill themselves in the future in search of another being of the man in the world. Therefore, a bibliographic research has been done and, as methodology of analysis, a dialectic critical method has been used to understand the reality in its contradictions and in the totality of the history, through some suggestions, going toward the domain of the state of things which we can verify in the world nowadays. It has been observed that the hypothetical landmarks of the environmental crisis had and have its origins in the Jewish-Christian monotheism, in the exacerbation of the reason as the only way of knowledge and in the process of capitalist accumulation. Therefore, these landmarks, in almost their totality, have historically been built even before the advent of the capitalism. From this point, three suggestions were launched as questions, or so, possibilities, to open a discussion about the construction of another paradigm: Is it necessary another sense of religion? Is it necessary another sense of reason? Is it necessary another sense of sustainable development? Thus, these questions which have been launched, were thought as the current necessities for the environmental education and they implicate in another historical condition to the mankind.