In this work we present a sistematic exposition of a result due to R. Maiíé and L. Rocha, who proved that the Julia set of a rational map of the Riemann sphere is uniíormly perfect. We start with necessary basic concepts and dose with a proof of a result of C. Pommerenke which allows us to condude the Dirichlet regularity of the Julia set.

In this work we present a sistematic exposition of a result due to R. Maiíé and L. Rocha, who proved that the Julia set of a rational map of the Riemann sphere is uniíormly perfect. We start with necessary basic concepts and dose with a proof of a result of C. Pommerenke which allows us to condude the Dirichlet regularity of the Julia set.

In this work we present a sistematic exposition of a result due to R. Maiíé and L. Rocha, who proved that the Julia set of a rational map of the Riemann sphere is uniíormly perfect. We start with necessary basic concepts and dose with a proof of a result of C. Pommerenke which allows us to condude the Dirichlet regularity of the Julia set.

Made available in DSpace on 2014-06-11T19:26:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-03-14Bitstream added on 2014-06-13T20:07:47Z : No. of bitstreams: 1 uceda_rma_me_sjrp.pdf: 517062 bytes, checksum: aff28312f73d1b91ddb23dde4fa63a1f (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Seja f : C ! C uma fun»c~ao polinomial. O conjunto de Julia, J(f), associado a f, é o conjunto dos números complexos z onde a família ffng dos iterados de f não é normal em z. Neste trabalho, estudaremos varias propriedades topológicas de J(f). Calcularemos também a dimensão de Hausdor® de J(fc), onde fc(z) = z2+c e jcj é grande, e estudaremos as propriedades do conjunto de Mandelbrot associado a fc, isto é, o conjunto M dos números complexos pelos quais J(fc)é conexo. Em particular provaremos o Teorema de Douady-Hubard que menciona que M é conexo. / Let f : C ! C be a polynomial function. The Julia set, J(f) associated to f, is the set of the complex numbers z where the family ffng of iterates of f is not normal at z. In this work, we will study many topological properties of J(f). We will compute the Hausdor® dimension of J(fc) too, where fc(z) = z2 + c and jcj is large, and we will study the properties of the Mandelbrot set associated to fc, that is, the set M of the complex numbers by which J(fc) is connected. In particular we will prove the Theorem of Douady-Hubard that mentions the connectedness of M.

Made available in DSpace on 2015-03-26T13:45:36Z (GMT). No. of bitstreams: 1 texto completo.pdf: 680613 bytes, checksum: d49992ace83b65d0a439badc8cc946f3 (MD5) Previous issue date: 2014-02-24 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / In this work we study some geometric properties of Julia sets and filled-in Julia sets of polynomials. In addition, we seek a form of measure the Julia set, for this we use the Hausdorff measure and determine a lower bound to the Hausdorff dimension of the Julia set. / Neste trabalho estudamos algumas propriedades geométricas do Conjunto de Julia e do e Conjunto de Julia Cheio. Além disso, procuramos uma forma de mensurar o conjunto de Julia, para isso utilizamos a medida de Hausdorff e determinamos uma cota inferior para a dimensão de Hausdorff do conjunto de Julia.

Made available in DSpace on 2014-06-11T19:32:22Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-03-15Bitstream added on 2014-06-13T21:04:11Z : No. of bitstreams: 1 uceda_ra_dr_sjrp.pdf: 905373 bytes, checksum: c2f0ae66c1c9b9621f826e692c6d9b4c (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Em 2000, Killeen e Taylor definiram a máquina de somar estocástica em base 2. Eles mostraram que o espectro do op erador de transi cão (agindo em l∞( N)), associado a essa máquina, e igual ao conjunto de Julia cheio de uma função quadrática. Nesse trabalho, estudamos outras propriedades espectrais e topológicass da máquina de Killeen e Taylor, e também das suas extensões à l∞(Z) e a outras bases não constantes. Esse estudo envolve conjuntos de Julia de funções quadráticas e também conjuntos de Julia cheios de endomor smos de C2 . Finalmente estudamos algumas propriedades aritméticas e topológicas de uma classe de fractais de Rauzy. Em particular estudamos o azulejamento periódico do plano complexo C induzido por eles. / In 2000, Killeen and Taylor de ned the sto hastic adding machine in base 2. They proved that the sp ectrum of the transition op erator (acting in l∞(N )) asso ciated to this machine is equal to the lled Julia set of a quadratic polynomial map. In this work, we study other sp ectral and top ological prop erties of Killeen and Taylor machine, and also of its extensions to l∞( Z) and to other non constant bases. This study envolves Julia sets of quadratic maps and also lled Julia sets of endomorphisms of C2 . Finally we study some arithmetical and topological prop erties of a class of Rauzy fractals. In particular we study the p erio dictiling of complex plane C induced by this class.