If X is a complex with a triangulation and if P is a homeomorph of a polyhedron in X with respect to this triangulation, then P is tame in X if there is a homeomorphism h of X onto itself and another triangulation of X in which h(P) is a polyhedron. A function from one complex X into a complex is called tame and is said to preserve tame sets if for each tame set PcX, f(P) is tame. Tame local homeomorphisms from triangulated n-manifolds into triangulated n-manifolds and tame light open maps of 2-manifolds into themselves are homeomorphisms. Connected complexes are compact if and only if every tame map of the complex into itself has a polyhedral image. Tame linear maps of Euclidean spaces and tame simplicial maps on triangulated n-manifolds with boundaries are homeomorphisms if their images are of dimension greater than one. Functions from polyhedra into topological spaces which take tame arcs onto sets consisting of finite number of components have images of, at most, a finite number of components. If the function and its inverse takes tame sets onto tame sets then the image is connected, provided its image is in a complex. If the function is from a topological space into a polyhedron, then it is continuous if and only if its inverse takes tame arcs onto closed sets. Finally a function from a complex to a complex is continuous if its inverse takes tame sets onto tame sets. A function from an n-manifold into an n-manifold which has an image of dimension greater than one and which takes arcs onto arcs or points is a homeomorphism. A function from a compact triangulated n-manifold into a topological space which takes tame arcs onto arcs or points and whose image is not an arc or point is a homeomorphism. A function from a triangulated n-manifold into an n-manifold which takes tame arcs onto arcs or points and whose image is of dimension greater than one is a homeomorphism. A function from a triangulated n-manifold into a triangulated n-manifold which takes tame arcs onto connected tame sets such that the image of no tame arc contains a triod is a homeomorphism if its image set is not a point, arc or simple closed curve. Finally there are tame maps which raise the dimension of sets. And there are 1:1 maps which do not preserve tame sets. A K-R manifold is a n-manifold with boundary whose interior is Eⁿ and whose boundary is Eⁿ⁻¹. A 1:1 map of a 2-dimensional K-R manifold onto a 2-dimensional K-R manifold is a homeomorphism. / Doctor of Philosophy

Este trabajo investiga el problema de la deserción y graduación de los estudiantes universitarios. Se utilizan modelos de riesgo proporcional no paramétricos para estimar los efectos cualitativos y cuantitativos de factores personales y características socioeconómica de los alumnos sobre las probabilidades condicionales de deserción y graduación. Se emplean datos de una cohorte de estudiantes de la carrera de Contador Público de la Universidad Nacional de Rosario, Argentina. Los hallazgos son útiles para evaluar y diseñar políticas públicas en el sector de educación. / This study examines the issue of student departure from a public university. Non-parametric proportional hazard models are used to estimate the quantity and quality effects of the students’ personal and socioeconomic characteristics on the probability of their dropping out or graduating. Data include a cohort of students who started studying accounting at National University of Rosario, Argentina, in 1991. The results are useful to evaluate and design public policies in the educational sector.

This project delivers to the scholar and performer a critical edition of a little-known horn concerto by Antonio Rosetti. Standing in contrast to performance or practical editions, critical editions demand that the editor exerts a non-trivial measure of authority over the state of the text. Performers often find this fact to be uncomfortable given the normal tendency to revere the perceived intent of the composers based upon the text that they set down. When engaging with sources, it is rarely clear what that intent is, or which of the available sources most closely represents that intent. Those available sources often disagree with one another, even those in the composer's own hand. It is vital for the editor to know, as precisely as is possible, who created the source material, when they created these sources, and why they created these sources. At that point the editor must decide which sources will best fit his or her framework for the creation of the critical edition. At that point the editor will grapple with numerous inconsistencies and ambiguities within those sources, and then use his or her own authority to fix the text of the composer's work into a single version for today's use. The Horn Concerto in E-flat Major (C41) by Rosetti presents a unique case to the editor, scholar, and performer, in that it exists in two versions that carry substantial differences in the solo part. These differences are so great that it is often difficult to consider them as representative of the same work. This edition presents both versions, as each have different original purposes, and edits them in parallel so that the performer may determine which usage is most appropriate for his or her needs.