Submitted by Diogo Barreiros (diogo.barreiros@ufba.br) on 2016-06-14T14:23:40Z No. of bitstreams: 1 Versão Digital - Dissertação - Andressa Souza.pdf: 965216 bytes, checksum: 9c87674ba9a02825f99d14466ddfb62f (MD5) / Approved for entry into archive by Alda Lima da Silva (sivalda@ufba.br) on 2016-06-14T14:26:27Z (GMT) No. of bitstreams: 1 Versão Digital - Dissertação - Andressa Souza.pdf: 965216 bytes, checksum: 9c87674ba9a02825f99d14466ddfb62f (MD5) / Made available in DSpace on 2016-06-14T14:26:27Z (GMT). No. of bitstreams: 1 Versão Digital - Dissertação - Andressa Souza.pdf: 965216 bytes, checksum: 9c87674ba9a02825f99d14466ddfb62f (MD5) / CAPES / Estudaremos uma fam lia de endomor smos bi-dimensionais, constru da por Marcelo Viana em [Vi97], de atratores n~ao-uniformemente hiperb olicos com sensibilidade as condi c~oes iniciais, em outras palavras, pontos na bacia de atra c~ao tem apenas expoentes de Lyapunov positivos. Estes sistemas tamb em ilustram um novo mecanismo robusto de din^amica sens vel. Apesar do car ater n~ao-uniforme da expans~ao, o atrator persiste numa vizinhan ca do mapa inicial. / We will study a family of two-dimensional endomorphisms built by Marcelo Viana in [Vi97], of non-uniformly hyperbolic attractors with sensitivity to initial conditions, in other words, points in the basin of attraction have only positive Lyapunov exponents. These systems also illustrate a new robust mechanism of sensitive dynamics. In spite of the non-uniform expansion, the attractor persists in a neighborhood of the initial map.