Algebraic Curves
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. Algebras with a weight function and one-point AG codes / Algebras munidas de função peso e codigos de Goppa pontuais
O objetivo principal desta dissertação é apresentar o resultado central de R. Matsumoto sobre as álgebras munidas de função peso serem anéis de coordenadas a fim de curvas algébricas com exatamente um lugar de grau um no infinito. A partir disto, pode-se concluir que os códigos de avaliação, introduzidos por Ho/holdt, van Lint e Pellikaan, constru
Publicado em: 2007
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14. Nahm transform of Higgs bundless on Riemann surface of genus at least two / Transformada de Nahm de fibrados de Higgs sobre superficies de Riemann de genero ao menos dois
We construct the Nahm transform of a stable, degree-zero Higgs bundle on a Riemann surface of genus at least 2. Atiyah-Singer?s index theorem is the basic tool employed, along with a vanishing theorem which is due to the stability hypothesis. Our main result is that the transformed bundle is hyperholomorphic and without flat factors. This not only recovers t
Publicado em: 2006
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15. Substitution-Newton-Raphson method applied to the modeling of a vapour compression refrigeration system using different representations of the thermodynamic properties of R-134a
This paper gives a detailed presentation of the Substitution-Newton-Raphson method, suitable for large sparse non-linear systems. It combines the Successive Substitution method and the Newton-Raphson method in such way as to take the best advantages of both, keeping the convergence features of the Newton-Raphson with the low requirements of memory and time o
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2002-07
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16. Contribuição ao estudo do controle automatico de geração
In this work, the basic concepts of the Automatic Control Generation of a Power System are presented, and the classical modelling methods are discussed. A new modelling approach was developed, where the complete representation of the interconnected system is considered. Alternating solutions of the differential equations of the machines and of the algebraic
Publicado em: 1983
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17. Some fundamental groups in the arithmetic of algebraic curves over finite fields
Associated with some systems of unramified coverings of algebraic curves over finite fields there are spaces analogous to the universal covering transformation spaces. These spaces have also arithmetic features; they represent all the Frobeniuses in the systems. This theory can be applied to the reduction mod [unk] of the Shimura curves.
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18. Algebraic complexities and algebraic curves over finite fields
We consider the problem of minimal (multiplicative) complexity of polynomial multiplication and multiplication in finite extensions of fields. For infinite fields minimal complexities are known [Winograd, S. (1977) Math. Syst. Theory 10, 169-180]. We prove lower and upper bounds on minimal complexities over finite fields, both linear in the number of inputs,
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19. Holomorphic curves in surfaces of general type.
This note answers some questions on holomorphic curves and their distribution in an algebraic surface of positive index. More specifically, we exploit the existence of natural negatively curved "pseudo-Finsler" metrics on a surface S of general type whose Chern numbers satisfy c(2)1>2c2 to show that a holomorphic map of a Riemann surface to S whose image is
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20. Padé approximations and diophantine geometry
Using methods of Padé approximations we prove a converse to Eisenstein's theorem on the boundedness of denominators of coefficients in the expansion of an algebraic function, for classes of functions, parametrized by meromorphic functions. This result is applied to the Tate conjecture on the effective description of isogenies for elliptic curves.
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21. Balance point characterization of interstitial fluid volume regulation
The individual processes involved in interstitial fluid volume and protein regulation (microvascular filtration, lymphatic return, and interstitial storage) are relatively simple, yet their interaction is exceedingly complex. There is a notable lack of a first-order, algebraic formula that relates interstitial fluid pressure and protein to critical parameter
American Physiological Society.
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22. Excursions along the Interface between Disruptive and Stabilizing Selection
When a polygenic character is exposed to natural selection in which the curve giving fitness as a function of phenotype is a mixture of two Gaussian (normal) curves, the population may respond either by evolving to a specialized phenotype near one of the two optimum phenotypes, or by evolving to a generalized phenotype between them. Using approximate multiva