Senior Honors Thesis--Regis University, Denver, Colo., 2007. / "May 2006." Date of submission on Certificate of Authorship: 30 April 2007. Title from PDF title page (viewed June 26, 2007). Includes bibliographical references.

El objetivo principal de la presente tesis es estudiar la estructura del anillo de Cobordismo Complejo MU*(pt). Milnor y Novikov fueron los primeros en mostrar que este es un anillo polinomial sobre generadores de grado par sobre Z. Este cálculo se realiza utilizando la sucesión espectral de Adams sobre una teoría de homología generalizada. La exposición de este teorema ocupa la parte final de este trabajo. En la primera parte se presenta el teorema de Adams sobre la convergencia de su sucesión espectral. En la segunda parte, se describe el espectro de Thom y la teoría de homología generalizada asociada a este espectro, que en este caso viene a ser el Cobordismo Complejo. También se describe de manera breve la estructura del Álgebra de Steenrod y su dual, que se utilizará al momento de calcular la estructura del anillo de homología H* (MU; Zp). Al final se adjunta un apéndice sobre álgebras y algebroides de Hopf, que incluye algunos isomorfismos de cambio de anillos. / The main objective of the present thesis is to study the structure of the Complex Cobordism Ring MU*(pt). Milnor y Novikov first accomplished this, and they(independently) showed that it is a polynomial ring over Z on generator of every even degree. It is achieved by using the Adams Spectral Sequence over a generalized theory. This theorem is expounded at the end of this work. In the first part, I present the theorem about the convergence of the Adams spectral sequence. In the second, I describe the Thom Spectrum and the generalized homology theory associated to this spectrum, in this case it is the Complex Cobordism. I also describe quickly the Steenrod Algebra and its dual, which will be used when we determine the structure of singular homology ring H * (MU; Zp). Finally, I attach an appendix about Hopf algebroides and Hopf algebras, which contains some change of ring isomorphism.

El objetivo del trabajo es presentar rasgos temáticos y estilísticos de la poesía de Thom Gunn. Este es un poeta británico y lo he elegido por su prolífica obra, en la cual se integran temáticas culturales y políticas como parte de su carrera como poeta. Desde sus comienzos como estudiante de Cambridge, "de algún modo, el carácter y la máscara de los poemas de Gunn es lo que Christopher Isherwood definió como "El Hombre Realmente Débil", que siempre toma una vía circular y más peligrosa porque no puede enfrentarse a decisiones tajantes que lo lanzarían a un viaje mucho más directo. Estas consideraciones hacen que Gunn sea un poeta sumamente interesante desde una perspectiva filosófica

El objetivo del trabajo es presentar rasgos temáticos y estilísticos de la poesía de Thom Gunn. Este es un poeta británico y lo he elegido por su prolífica obra, en la cual se integran temáticas culturales y políticas como parte de su carrera como poeta. Desde sus comienzos como estudiante de Cambridge, "de algún modo, el carácter y la máscara de los poemas de Gunn es lo que Christopher Isherwood definió como "El Hombre Realmente Débil", que siempre toma una vía circular y más peligrosa porque no puede enfrentarse a decisiones tajantes que lo lanzarían a un viaje mucho más directo. Estas consideraciones hacen que Gunn sea un poeta sumamente interesante desde una perspectiva filosófica

Neste trabalho é desenvolvido um estudo sobre a relação entre as variedades de Thom-Boardman e os ideais jacobianos iterados associados a estas variedades. Inicialmente são estudadas as singularidades de Thom-Boardman associadas a germes de aplicações analíticas com a finalidade de introduzir as varidades de Thom-Boardman no espaço dos jatos. Posteriormente são estudados os ideais jacobianos extendidos, seguindo a construção de Morin. Finalmente é definida a multiplicidade c_i(f) associada a um símbolo de Boardman i=(i_1,...,i_k) e ao extrato (Sigma)^1(f). / In this work we study the relation between the Thom-Boardman manifolds and the iterated jacobian ideals associate to these manifolds. First, we study the Thom-Boardman singularities associate to analitic map germs with the objective to introduce Thom-Boardman manifolds in the jet space. After, we study the extended jacobians ideals, following Morin's construction. We give the definition of the mulitiplicity c_i(f) associate to a Boadman symbol i=(i_1,...,i_k) and the stratum (Sigma)^i(f).

An examination of the musical style, compositional techniques and performance practice issues of American composer Thom Ritter George with special attention paid to his Quintet No. 4 written in 1986. The document also includes a short history of brass instruments in chamber music, history of the brass quintet in America, discussion of the role of the trumpet in the quintet, overview of the composers contributions to music and brass quintet in America, discussion of the role of the trumpet in the quintet, overview of the composers contributions to music and brass quintet, and background information on the composer.

Neste trabalho é desenvolvido um estudo sobre a relação entre as variedades de Thom-Boardman e os ideais jacobianos iterados associados a estas variedades. Inicialmente são estudadas as singularidades de Thom-Boardman associadas a germes de aplicações analíticas com a finalidade de introduzir as varidades de Thom-Boardman no espaço dos jatos. Posteriormente são estudados os ideais jacobianos extendidos, seguindo a construção de Morin. Finalmente é definida a multiplicidade c_i(f) associada a um símbolo de Boardman i=(i_1,...,i_k) e ao extrato (Sigma)^1(f). / In this work we study the relation between the Thom-Boardman manifolds and the iterated jacobian ideals associate to these manifolds. First, we study the Thom-Boardman singularities associate to analitic map germs with the objective to introduce Thom-Boardman manifolds in the jet space. After, we study the extended jacobians ideals, following Morin's construction. We give the definition of the mulitiplicity c_i(f) associate to a Boadman symbol i=(i_1,...,i_k) and the stratum (Sigma)^i(f).

Le contexte général de cette thèse est l’étude de problèmes inverses et directs en théorie du contrôle. Plus précisément, les trois problèmes étudiés sont les suivants.Le premier est un problème de contrôle optimal (approche directe). Il s’agit de fournir la synthèse temps minimum du modèle cinématique d'un drone volant à altitude constante, de vitesse linéaire non nécessairement constante voulant rejoindre une trajectoire circulaire de rayon de courbure minimum.Le deuxième problème concerne une approche inverse du contrôle optimal. Il s’agit d’élaborer des méthodes théoriques de reconstruction du critère optimisé dans un problème de contrôle optimal à partir d’un ensemble de solutions à ce problème, ainsi que caractériser les "bons" ensembles de trajectoires permettant la reconstruction du critère. Le contrôle optimal inverse connait un regain d’intérêt depuis une quinzaine d’années, en particulier dans l’étude des comportements moteurs humains. En effet, selon un paradigme largement accepté en neurophysiologie, parmi tous les mouvements possibles ceux effectivement réalisés sont solutions d’un processus d’optimisation.Le troisième problème traite de stabilisation par retour de sortie. Nous analysons, à travers un exemple académique tiré du contrôle quantique, le problème de stabilisation par retour de sortie (à l’aide d’un observateur) lorsque le point où l'on souhaite stabiliser le système correspond à un contrôle qui rend le système inobservable. L’idée générale est de perturber le retour d’état stabilisant afin de garantir l’observabilité du système tout en stabilisant le système sur la cible. L’analyse de cet exemple académique nous permet dans un second temps de dégager une méthode générale pouvant s’appliquer à une classe de système beaucoup plus large. / The overall context of this thesis is the study of inverse and direct problems in control theory. More specifically, the following three problems are studied.The first one is an optimal control problem (direct approach). The aim is to give a time minimum systhesis fora kinematic model of a UAV flying at constant altitude with positive (non-necessarily constant) linear velocityin order to steer it to a fixed circle of minimum turning radius.The second problem deals with an inverse approach of optimal control. The aim is to develop theoretical methods in order to reconstruct the minimized criterion in an optimal control problem from a set of solution to this problem. The aim is also to characterize the « good » sets of trajectories leading to the reconstruction of the criterion. In the last fifteen years, there has been a renewed interest in inverse optimal control, especially inhuman motor behavior. Indeed, according to a well accepted paradigm in neurophysiology, among all possible movements, those actually accomplished are solutions of an optimization process.The third problem tackles output feedback stabilization. We analyze, via a simple academic example from quantum control, the problem of dynamic output feedback stabilization, when the point where we want to stabilize corresponds to a control value that makes the system unobservable. The general idea is to perturb the stabilizing state feedback in order to ensure the observability of the system while stabilizing it to the target.The analysis of this example allows, secondly, to identify a general procedure that can be applied to a widerclass of systems.

En 1979, Trotman a démontré que les stratifications réelles lisses qui satisfont la condition de (a)-régularité sont précisément celles pour lesquelles la transversalité aux strates des applications est une condition stable dans la topologie forte. C'était un résultat surprenant puisque la (t)-régularité semblait être plus appropriée pour la stabilité de la transversalité, une erreur qui a été faite dans plusieurs articles avant que ce résultat soit montré par Trotman. Notre premier résultat est un analogue au résultat de Trotman pour la topologie faible.Il y a une dizaine d'années Trotman a demandé si le même résultat est valable pour les stratifications analytiques complexes. Dans ce travail on démontre un analogue du résultat de Trotman dans le cas complexe, en utilisant la notion de variété de Oka introduite par Forstneric et on montre que la conjecture n'est pas vraie en général en donnant des contre-exemples.Dans sa thèse, Trotman a formulé une conjecture pour généraliser son résultat pour les stratifications (a_f)-régulières de Thom. Dans une tentative de résolution de cette conjecture on a observé que la transversalité par rapport à un feuilletage est une condition stable, cependant ce n'est pas une condition générique. Donc, en voulant imiter la preuve de Trotman on ne pourra pas obtenir cette généralisation. Néanmoins, on donne ici une preuve de cette conjecture. Ce résultat peut être résumé en disant que les (a_f)-défauts dans une stratification peuvent être détectés en perturbant les applications transverses au feuilletage induit par f. Certaines techniques pour détecter (a_f)-défauts sont aussi données vers la fin. / Trotman in 1979 proved that real smooth stratifications which satisfy the condition of $(a)$-regularity are precisely those stratifications for which transversality to the strata of smooth mappings is a stable condition in the strong topology. This was a surprising result since $(t)$-regularity seemed to be more appropriate for stability of transversality, a mistake that was made in several articles before this result of Trotman. Our first result is an analogue of this result of Trotman for the weak topology.Trotman asked more than ten years ago whether a similar result holds for complex analytic stratifications. We will give an analogue of Trotman's result in the complex setting using Forstneriv c's notion of Oka manifolds and show that the result is not true in general by giving counterexamples.In his Ph.D. thesis Trotman conjectured a generalization of his result for Thom $(a_f)$-regular stratifications. In an attempt to prove this conjecture we noticed that while transversality to a foliation is a stable condition, it is not generic in general. Thus, mimicking the proof of the result of Trotman would not suffice to obtain this generalization. Nevertheless, we will present a proof of this conjecture in this work. This result can be summarized by saying that Thom $(a_f)$-faults in a stratification can be detected by perturbation of maps transverse to the foliation induced by $f$. Some other techniques of detecting $(a_f)$-faults are also given towards the end.

Made available in DSpace on 2015-05-15T11:46:05Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 547480 bytes, checksum: 23748fbdacd76846a114baea058b21f6 (MD5) Previous issue date: 2013-05-27 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In this work we study implicit differential equations. Following the Thom tranversality theorem and the singularity theory we find an open and dense subset of this equation class that present only good singularity. This singularity are of six kind well folded saddle, well folded node, well folded focus, elliptical gather, hyperbolic gather. Davydov,in [8] showed the normal forms of a IDE in the case of well folded saddle, well folded node, well folded focus. In the case of gathered singularities, Davydov showed that the normal forms of IDE contains functional moduli. For a special class of implicit differential equation, the binary differential equation (BDE), we study the normal forms in the case in that the discriminant is a Morse function. / Neste trabalho estudamos singularidades de equações diferenciais implícitas. Usando o Teorema de Transversalidade de Thom e a teoria das singularidades encontramos um subconjunto aberto e denso desta classe de equações que apresentam singularidades boas. Estas singularidades são apenas de seis tipos dobra-sela, dobra-nó, dobra-foco, cúspide elíptica e cúspide hiperbólica. Davydov, em [8], mostrou as formas normais da EDI nos casos de dobra-sela, dobra-nó e dobra-foco. No caso de cúspides, Davydov mostrou que as formas normais da EDI apresentam parâmetros e funções arbitrárias. Para uma classe especial de equações diferenciais implícitas, as equações diferenciais binária (EDB), estudamos a forma normal nos casos em que o discriminante é uma função de Morse.