Thesis--Bonn. / Includes bibliographical references (p. 58-59).

Thesis--Bonn. / Includes bibliographical references (p. 58-59).

We enlarge the class of Beltrami equations by developping a stability theory for the sheaf of solutions of an overdetermined elliptic system of first order homogeneous partial differential equations with constant coefficients in the Euclidean space.

It is well known that, as a consequence of the Identity Theorem, we cannot "glue" together two analytic functions to create a new globally analytic function. In this paper we will both introduce and investigate special homeomorphisms, called quasiconformal maps, that are generalizations of the well known conformal maps. We will show that quasiconformal maps make this "gluing," up to conjugation, possible. Quasiconformal maps are a valuable tool in the field of complex dynamics. We will see how quasiconformal maps of infinitesimal circles have an image of an infinitesimal ellipse. Although quasiconformal maps are nice homeomorphisms, they might only be differentiable in the real sense almost everywhere and, surprisingly, complex differentiable nowhere. We shall rely on the work of Lehto and Virtanen as well as Shishikura in exploring these interesting complex valued functions. / Department of Mathematical Sciences

Lam, Ka Chun. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references (leaves 64-68). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts also in Chinese.

Thesis advisor: Martin J. Bridgeman / Thesis advisor: Ian Biringer / The first part of this dissertation is on the quasiconformal homogeneity of surfaces. In the vein of Bonfert-Taylor, Bridgeman, Canary, and Taylor we introduce the notion of quasiconformal homogeneity for closed oriented hyperbolic surfaces restricted to subgroups of the mapping class group. We find uniform lower bounds for the associated quasiconformal homogeneity constants across all closed hyperbolic surfaces in several cases, including the Torelli group, congruence subgroups, and pure cyclic subgroups. Further, we introduce a counting argument providing a possible path to exploring a uniform lower bound for the nonrestricted quasiconformal homogeneity constant across all closed hyperbolic surfaces. We then move on to identities on hyperbolic manifolds. We study the statistics of the unit geodesic flow normal to the boundary of a hyperbolic manifold with non-empty totally geodesic boundary. Viewing the time it takes this flow to hit the boundary as a random variable, we derive a formula for its moments in terms of the orthospectrum. The first moment gives the average time for the normal flow acting on the boundary to again reach the boundary, which we connect to Bridgeman's identity (in the surface case), and the zeroth moment recovers Basmajian's identity. Furthermore, we are able to give explicit formulae for the first moment in the surface case as well as for manifolds of odd dimension. In dimension two, the summation terms are dilogarithms. In dimension three, we are able to find the moment generating function for this length function. / Thesis (PhD) — Boston College, 2015. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Mathematics.

Orientador: José Marcio Machado / Banca: Gilberto Aparecido Pratavieira / Banca: Manoel Ferreira Borges Neto / Resumo: As funções hipercomplexas do tipo zn, n natural, têm uma dilatação linear K uniformemente limitada em um domínio simplesmente conexo D, então podem ser classificadas de funções K-quaseconformes. Procuramos aqui quantificar K e verificar suas dependências. Para tanto, as generalizações de zn foram necessárias e obtidas, originando para z escrito em coordenadas esféricas, polinômios em função de um raio r. / Abstract: The hypercomplex functions of zn type, natural n, have a linear dilatation K, uniformly limited in a connected domain D, so they can be classified in K-quasiconformal functions. We try here to quantify K and check its dependancy. To enable this, the generalizations of zn were necessary and obtained be-forehand, originating for z written in spherical coordenates, polynomial according to a radial r. / Mestre

by Wong Chun-fai. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1994. / Includes bibliographical references (leaves 81-82). / Chapter CHAPTER0 --- Introduction --- p.1 / Chapter CHAPTER1 --- Teichmuller Space of genus g --- p.5 / Chapter 1.1. --- Teichmiiller Space of genus g / Chapter 1.2. --- Fuchsian Model and Discrete subgroup of Aut(H) / Chapter 1.3. --- Fricke Space / Chapter CHAPTER2 --- Hyperbolic Geometry and Fenchel-Nielsen Coordinates --- p.14 / Chapter 2.1. --- Poincare Metric and Hyperbolic Geometry / Chapter 2.2. --- Fenchel-Nielsen Coordinates / Chapter 2.3. --- Fricke-Klein Embedding / Chapter CHAPTER3 --- Quasiconformal Mappings --- p.23 / Chapter 3.1. --- Definitions / Chapter 3.2. --- Existence Theorems on Quasiconformal Mappings / Chapter 3.3. --- Dependence on Beltrami Coefficients / Chapter CHAPTER4 --- Teichmuller Spaces --- p.37 / Chapter 4.1. --- Analytic Construction of Teichmiiller Spaces / Chapter 4.2. --- Teichmiiller mapping and Teichmiiller Theorem / Chapter 4.3. --- Teichmiiller Uniqueness Theorem / Chapter CHAPTER5 --- Complex Analytic Theory of Teichmiiller Spaces --- p.50 / Chapter 5.1. --- Bers' Embedding and the complex structure of Teichmiiller Space / Chapter 5.2. --- Invariance of Complex Structure of Teichmiiller Space / Chapter 5.3. --- Teichmiiller Modular Groups / Chapter 5.4. --- Classification of Teichmiiller Modular Transformations / Chapter CHAPTER6 --- Weil-Petersson Metric --- p.68 / Chapter 6.1. --- Petersson Scalar Product and Reproducing formula / Chapter 6.2. --- Infinitesimal Theory of Teichmuller Spaces / Chapter 6.3. --- Weil-Petersson Metric / BIBLIOGRAPHY --- p.81

Thesis (Ph. D.)--University of Washington, 2004. / Vita. Includes bibliographical references (leaves 108-111).

Orientador: Manoel Ferreira Borges Neto / Banca: Masayoshi Tsuchida / Banca: Siovani Felipussi / Resumo: Neste trabalho estudamos transformações quaseconformes no contexto dos octônios, que são hipercomplexos de oito dimensões. Por não preservar a magnitude dos ângulos, mapeamentos quaseconformes causam uma dilatação linear. A partir da definição métrica de quaseconformidade, utilizamos a forma binomial para mostrar que a distância jf(y) ¡ f(x)j pode ser escrita como um polinômio em r. Com isso, pudemos desenvolver não são um conjunto de fórmulas como também um método computacional simplificado para o cálculo analítico da dilatação. Posteriormente, utilizamos ferramentas gráficas para vizualizar as consequências da dilatação. / Abstract: In this work we study quasiconformal mappings related to octonionic algebra. Since quasicon- formal mappings do not preserve the magnitude of the angles they cause a linear dilatation. We show that it also happens to 8-dimensional hipercomplex. Based on the metric de¯nition of quasiconformal mapping we show that the distance jf(y)¡f(x)j is a polynomial of variable r. Then it¶s possible to make not only a set of formulas but also a computacional method to calculate the dilatation. We also use some graphical tools to visualize the consequences of dilatation. / Mestre