• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 14
  • 13
  • 6
  • 3
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 44
  • 44
  • 14
  • 14
  • 14
  • 12
  • 9
  • 9
  • 9
  • 8
  • 7
  • 6
  • 6
  • 6
  • 5
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Ungeordnete Zahlpartitionen mit k Parts, ihre 2^(k - 1) Typen und ihre typspezifischen erzeugenden Funktionen

Lösch, Manfred 06 December 2012 (has links) (PDF)
Jede ungeordnete Zahlpartition mit k Parts (k-Partiton) hat einen Typ, der mittels einer geordneten Partition von k definiert werden kann. Es können somit 2^(k - 1) Typen definiert werden. Pro Typ gibt es eine eindeutig nummerierbare erzeugende Funktion der geschlossenen Form. Mit Rekursionen können diese Funktionen in (unendlich lange) Potenzreihen expandiert werden. Mit diesen erzeugenden Funktionen lassen sich Bijektionen zwischen den Partitionsmengen verschiedener Typen aufspüren.
32

Three Variable Analogue of Boas and Buck Type Generating Functions and Its Generalizations to M-Variables / Three Variable Analogue of Boas and Buck Type Generating Functions and Its Generalizations to M-Variables

Ahmad Khan, Mumtaz, Alidad, Bahman 25 September 2017 (has links)
The present papers deals with three variable analogue of Boas and Buck [14] type generating functions forpolynomials of two variables and then the same has been extended for m-variable analogue. The results obtained are extensions of those obtained by us in our earlier paper [14]. / El presente artículo trata el anólogo de tres variables de la función generatriz de Boas and Buck [14] para polinomios de dos variables y lo mismo se puede extender para el análogo de m variables. Los resultados obtenidos son extensiones de un artículo previo [14].
33

Método gerador de distribuições e classes de distribuições probabilísticas

BRITO, Cícero Carlos Ramos de 07 August 2014 (has links)
Submitted by (ana.araujo@ufrpe.br) on 2016-05-25T17:33:53Z No. of bitstreams: 1 Cicero Carlos Ramos de Brito.pdf: 2928725 bytes, checksum: 35b3038da8b53c426368cd7ed2c96e03 (MD5) / Made available in DSpace on 2016-05-25T17:33:53Z (GMT). No. of bitstreams: 1 Cicero Carlos Ramos de Brito.pdf: 2928725 bytes, checksum: 35b3038da8b53c426368cd7ed2c96e03 (MD5) Previous issue date: 2014-08-07 / This work is divided into five chapters. The first one contains the objectives and the relevance of this study. In the second one, we review the literature presenting the state of the art in the field and we give an overview of the most used distributions which are the basis for the ones we generalize in later chapters. In the third chapter, the method for generating distributions is presented by means of a theorem and 7 corollaries. This method extends the probability distribution building process, so that the classes of distributions are constructed from pre-defined univariate monotonic functions and known distributions. In the fourth chapter, similarly to the third one, however, the construction was made from pre-defined multivariate monotonic functions and known multivariate distributions. We also conducted the development of new probability distributions and new generating functions of probability distribution classes. We illustrate the potentiality of this new univariate probability distribution we propose here by means of an application to an actual data set of excesses of flood peaks presented by Choulakian e Stephens (2001). For the application of the new multivariate distribution proposed, we used the database of measurements of Iris Flower exposed in Fisher’s work (1936). Six models were compared and, for their choice, we based on the Akaike Information Criterion (AIC), the Akaike Information Criterion corrected (AICc), Bayesian Information Criterion (BIC), the Hannan Quinn Information Criterion (HQIC) and the statistics of Cramér-von Mises and Anderson-Darling to assess the model fitting. Finally, we present the conclusions from de analyses, the comparisons from the results found in this thesis, the possibilities for research and ways to future works. / Este trabalho divide-se em cinco capítulos. No primeiro trazemos a introdução que contém os objetivos e a relevância deste estudo. No segundo, temos a revisão da literatura em que apresentamos o estado da arte deste campo do conhecimento e fazemos um apanhado das distribuições mais utilizadas que são base para as que generalizamos em capítulos posteriores. No terceiro capítulo, apresenta-se o método gerador, que é um teorema proposto com 7 corolários, que estende o processo de construções de distribuições de probabilidades, a fim de que as classes de distribuições sejam construídas a partir de funções monotônicas univariadas pré-definidas e distribuições conhecidas. No quarto capítulo foi trabalhado semelhantemente ao terceiro, entretanto, a construção se deu a partir das funções monotônicas multivariadas pré-definidas e distribuições multivariadas conhecidas. Também foi realizado o desenvolvimento das novas distribuições probabilísticas e novas funções geradoras de classes de distribuições probabilísticas. Ilustramos a potencialidade da nova distribuição de probabilidade univariada aqui proposta através de uma aplicação ao conjunto de dados reais de excessos de picos de enchentes apresentado em Choulakian e Stephens (2001). Para uma aplicação da nova distribuição multivariada proposta, utilizou-se a base de dados de medidas da Flor de Iris apresentada no trabalho de Fisher (1936). São comparados seis modelos e para a seleção desses modelos, foram utilizados o Critério de Informação de Akaike (AIC), o Critério de Informação de Akaike corrigido (AICc), o Critério de Informação Bayesiano (BIC), o Critério de Informação Hannan Quinn (HQIC) e as estatísticas de Cramer Von-Mises e de Anderson-Darling para avaliar o ajuste dos modelos. Por fim, apresentamos as conclusões a partir das análises e comparações dos resultados obtidos e direções a trabalhos futuros.
34

Demonstrações bijetivas em partições / Bijectives demonstrations in partitions

Mucelin, Cláudio 17 August 2018 (has links)
Orientador: Andréia Cristina Ribeiro / Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Instituto de Matemática, Estatística e Computação Científica / Made available in DSpace on 2018-08-17T16:44:00Z (GMT). No. of bitstreams: 1 Mucelin_Claudio_M.pdf: 744549 bytes, checksum: 062211ac0a3abf9bcf171fe9881dcafa (MD5) Previous issue date: 2011 / Resumo: Este trabalho apresenta alguns resultados sobre partições de números inteiros e a importância deles na história da Matemática e da Teoria dos Números. Encontrar demonstrações bijetivas em partições não é nada fácil. Mas, depois de encontradas, tornam-se uma maneira agradável e fácil de entender e provar algumas Identidades de Partições. Este trabalho pretende ser didático e de fácil entendimento para futuras pesquisas de estudantes que se interessem pelo assunto. Ele traz definições básicas e importantes sobre partições, os Gráficos de Ferrers, demonstrações de resultados interessantes como a Bijeção de Bressoud e o Teorema Pentagonal de Euler. Destaca também a importância das funções geradoras e alguns resultados devidos a Sylvester, Dyson, Fine, Schur e Rogers-Ramanujan / Abstract: This work presents some results about partitions of integers numbers and their importance in the history of Mathematics and in the Theory of the Numbers. To find bijective demonstrations in partitions it is not easy. But, after finding them, to understand and to prove some Identities of Partitions becomes agreeable and easy. This work intends to be didatic and of easy understanding for future researches made by students interested in this subject. It contains basic and important definitions about partitions, the Ferrers' Graphics, demonstrations of interesting results as the Bressond's Bijection and the Euler's Pentagonal Theorem. It also details the importance of the generating functions and some results due to Sylvester, Dyson, Fine, Schur and Rogers-Ramanujan / Mestrado / Teoria dos Numeros / Mestre em Matemática
35

Função geradora : uma ferramenta de contagem

Machado, John William dos Santos 17 July 2015 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Counting techniques studied in basic education aim at the resolutions os simplest combinatorial problems. In this work, we present the generating functions, a powerful tool to solving more complex problems of counting. In this way, we discuss the contents of combinatorial analysis through the study of generating functions, proposing a didactic sequence on the subject for teachers of basic education can expand and diversify their teaching strategies, by means of this counting method. / As t ecnicas de contagem estudadas na educação b ásica visam as resolu ções de problemas combinat órios mais simples. Neste trabalho, apresentaremos as funções geradoras, uma poderosa ferramenta para solucionar problemas mais complexos de contagem. Destaforma, abordaremos o conte udo de an alise combinat ória atrav és do estudo de funções sgeradoras, propondo uma sequência did ática sobre o tema para que os professores da educação b ásica possam ampliar e diversi car as suas estrat égias de ensino, a a partir deste novo método de contagem.
36

Álgebras associadas a grafos orientados em níveis e a propriedade da Koszulidade / Algebras associated to layered directed graphs and Koszulity property

Vasconcelos, José Eder Salvador de 20 November 2014 (has links)
Submitted by Erika Demachki (erikademachki@gmail.com) on 2015-04-22T21:00:51Z No. of bitstreams: 2 Tese - José Eder Salvador de Vasconcelos - 2014.pdf: 10572296 bytes, checksum: 40616b346bd2479e01caf5eeea4cfe68 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Erika Demachki (erikademachki@gmail.com) on 2015-04-22T21:03:08Z (GMT) No. of bitstreams: 2 Tese - José Eder Salvador de Vasconcelos - 2014.pdf: 10572296 bytes, checksum: 40616b346bd2479e01caf5eeea4cfe68 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2015-04-22T21:03:08Z (GMT). No. of bitstreams: 2 Tese - José Eder Salvador de Vasconcelos - 2014.pdf: 10572296 bytes, checksum: 40616b346bd2479e01caf5eeea4cfe68 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2014-11-20 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In this work we study classes of algebras associated with layered directed graphs. Let 􀀀 be a layered directed graph. We determine the algebra Ap􀀀q; generated by the edges of the graph, satisfying a set of quadratic relations R; and the dual algebra Ap􀀀q!, associated with grpAp􀀀qq. For each P Autp􀀀q we determine: the algebra Ap􀀀 q; where 􀀀 is the subgraph of 􀀀 whose vertices are xed by ; the graded trace generating functions Tr pAp􀀀q; tq and Tr pAp􀀀q!; tq: We also determine the multiplicities of the irreducible representations of AutpAp􀀀qq acting on Ap􀀀q and Ap􀀀q!: We show that for a layered directed graph 􀀀, satisfying some hypotheses, AutpAp􀀀qq K Autp􀀀q. Finally, we verify the property Tr pAp􀀀q; tq Tr pAp􀀀q!; tq 1 for all P Autp􀀀q, called koszulity property. We consider two classes of algebras, the algebra associated to the Hasse graph of the partially ordered set of faces of a star polygon, Ap􀀀 q; and the algebra associated with the Hasse graph of the lattice of subespaces of a nite dimensional vector space over Fq; ApLpn; qqq: / Este trabalho apresenta o estudo de algumas classes de álgebras associadas a grafos orientados em níveis. Dado um grafo orientado em níveis 􀀀 (satisfazendo algumas propriedades) determinamos a álgebra Ap􀀀q gerada pelas arestas do grafo, satisfazendo um conjunto de relações quadráticas R, e a álgebra dual Ap􀀀q!, associada a grpAp􀀀qq. Para cada P Autp􀀀q determinamos o grafo 􀀀 ; o subgrafo de 􀀀 dos vértices xados por ; que dá origem à álgebra Ap􀀀 q e calculamos as funções geradoras do traço graduado Tr pAp􀀀q; tq e Tr pAp􀀀q!; tq: Determinamos as multiplicidades das representações irredutíveis de AutpAp􀀀qq sobre Ap􀀀q e Ap􀀀q!. Mostramos que para um grafo orientado em níveis 􀀀, satisfazendo certas hipóteses, tem-se AutpAp􀀀qq K Autp􀀀q. Finalmente, veri camos a validade da equação Tr pAp􀀀q; tq Tr pAp􀀀q!; tq 1 para todo P Autp􀀀q; a qual denominamos propriedade da koszulidade. Fazemos isso para duas classes de álgebras, a álgebra associada ao grafo de Hasse do conjunto parcialmente ordenado das faces de um polígono estrelado, Ap􀀀 q, e a álgebra associada ao grafo de Hasse do reticulado dos subespaços vetoriais de um espaço vetorial de dimensão nita sobre Fq, ApLpn; qqq.
37

Constructions de sous-variétés legendriennes dans les espaces de jets d'ordre un de fonctions et fonctions génératrices / Constructions of Legendrian submanifolds in spaces of 1-jets of functions and generating functions

Limouzineau, Maÿlis 21 October 2016 (has links)
Dans cette thèse, on manipule deux types d'objets fondamentaux de la topologie de contact : les sous-variétés legendriennes des espaces de 1-jets de fonctions dé finies sur une variété M, noté J1(M;R), et la notion intimement liée de fonctions génératrices. On étudie des "opérations" que l'on peut faire sur ces objets, c'est-à-dire des procédures qui construisent (génériquement) de nouvelles sous-variétés legendriennes à partir d'anciennes. On dé finit en particulier les opérations somme et convolution des sous-variétés legendriennes, qui sont conjuguées par une transformation de type transformée de Legendre. Nous montrons que ces opérations se refl ètent harmonieusement dans le monde des fonctions génératrices. Ce second point de vue nous conduit en particulier à nous interroger sur l'effet de nos opérations sur le sélecteur, notion classique de géométrie symplectique dont on adapte la construction à ce contexte. Pour fi nir, on se concentre sur l'espace à trois dimensions J1(R;R) et sur les noeuds legendriens qui admettent (globalement) une fonction génératrice. C'est une condition forte sur les sous-variétés legendriennes, que l'on choisit d'étudier en proposant plusieurs constructions explicites. On termine avec l'étude des notions de cobordisme legendrien naturellement associées, où l'opération somme évoquée plus s'avère tenir une place centrale. / This thesis concerns two types of fundamental objects of the contact topology : Legendrian submanifolds in 1-jet spaces of functions de fined on a manifold M, denoted by J1(M;R), and the closed related notion of generating functions. We study "operations" that build (generically) new Legendrian submanifolds from old ones. In particular, we de fined the operations sum and convolution of Legendrian submanifolds, which are linked by a form of the Legendre transform. We show how the operations are well re flected in terms of generating functions. It offers a second point of view and leads us to wonder the effect of our operations on the selector, which is a classical notion of symplectic geometry, and we adapt its construction to this context. Finally, we focus on the three dimensional space J1(R;R) and Legendrian knots which admit a (global) generating function. It is a strong condition for Legendrian submanifolds, and we choose to examine it by proposing several explicit constructions. We conclude by studying the notions of Legendrian cobordism which are naturally related. The operation sum mentioned before finds there a central role.
38

Ungeordnete Zahlpartitionen mit k Parts, ihre 2^(k - 1) Typen und ihre typspezifischen erzeugenden Funktionen

Lösch, Manfred 06 December 2012 (has links)
Jede ungeordnete Zahlpartition mit k Parts (k-Partiton) hat einen Typ, der mittels einer geordneten Partition von k definiert werden kann. Es können somit 2^(k - 1) Typen definiert werden. Pro Typ gibt es eine eindeutig nummerierbare erzeugende Funktion der geschlossenen Form. Mit Rekursionen können diese Funktionen in (unendlich lange) Potenzreihen expandiert werden. Mit diesen erzeugenden Funktionen lassen sich Bijektionen zwischen den Partitionsmengen verschiedener Typen aufspüren.:1. Kurze Vorbetrachtung 2. Typen der ungeordneten k-Partitionen 3. Konstruktion der GF (generating function) des allgemeinen Typs 4. Nummerierung der konstruierten GF 5. Weitere Analysen zur konstruierten GF 6. Die konjugierten der typspezifischen k-Partitionen 7. Vereinfachte GF-Symbolik 8. Eine programmierbare Basis-GF 9. Dekomposition von Q(x, k) in typspezifische GF''s 10. Rekursives Expandieren typspezifischer GF''s 11. GF-Zerlegungen und Bijektionen 12. Zahlen, die in k-Partitionen aller Typen zerlegbar sind 13. Referenzen
39

Asymptotic enumeration via singularity analysis

Lladser, Manuel Eugenio 15 October 2003 (has links)
No description available.
40

Coefficients de Clebsch-Gordan de la super-algèbre osp(1|2)

Bergeron, Geoffroy 08 1900 (has links)
Les fonctions génératrices des coefficients de Clebsch Gordan pour la superalgèbre de Lie osp(1|2) sont dérivées en utilisant deux approches. Une première approche généralise une méthode proposée par Granovskii et Zhedanov pour l'appliquer dans le cas de osp(1|2), une algèbre dont le coproduit est torsadé. Une seconde approche repose sur la réalisation de osp(1|2) en tant qu'algèbre dynamique d'un oscillateur parabosonique et utilise une équivalence dans cette réalisation entre le changements de coordonnées polaires à cartésiennes et le problème de Clebsch-Gordan. Un chapitre moins formel précède ces dérivations et présente comment le problème de Clebsch-Gordan s'interprète en tant que réalisation d'une algèbre de fusion. La notion abstraite de fusion est introduite, soulignant son importance en physique, pour en venir au cas particulier du problème de Clebsch-Gordan. Un survol du cas de l'algèbre osp(1|2) et de ses utilisations en physique mathématique conclut ce chapitre. / The generating functions for the osp(1|2) Lie superalgebra Clebsch-Gordan coefficients are derived using two approaches. The first one consists of generalizing a method first proposed by Granovskii and Zhedanov to apply it to the case of osp(1|2), an algebra with a twisted coproduct. The second one is based on the realization of the osp(1|2) as the dynamical algebra for a parabosonic oscillator and used an equivalence in this realization between a change of basis from polar to cartesian coordinates and the Clebsch-Gordan problem. A less formal chapter precedes those derivations and present how the Clebsch-Gordan problem can be interpreted as a realization of a fusion algebra. The abstract notion of fusion is introduced, mentionning its importance in physics, and leads to the particular case of the Clebsch-Gordan problem. A brief review of the problem for the osp(1|2) algebra and its uses in mathematical physics concludes this chapter.

Page generated in 0.1568 seconds