O número médio de representações de um inteiro positivo como soma dos quadrados de dois inteiros
This paper aims to address two themes: the representation of positive integers as sum of squares and the average number of representations of a positive integer as the sum of two squares. About the first theme, we will prove several results to understand under what conditions a positive integer has...
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2017 |
| País: | Brasil |
| Institución: | Universidade Federal do Ceará (UFC) |
| Repositorio: | Repositório Institucional da Universidade Federal do Ceará (UFC) |
| Idioma: | portugués |
| OAI Identifier: | oai:repositorio.ufc.br:riufc/24963 |
| Acceso en línea: | http://www.repositorio.ufc.br/handle/riufc/24963 |
| Access Level: | acceso abierto |
| Palabra clave: | Números inteiros Soma de quadrados Função s2 Integers Sum of squares Function s2 |
| Sumario: | This paper aims to address two themes: the representation of positive integers as sum of squares and the average number of representations of a positive integer as the sum of two squares. About the first theme, we will prove several results to understand under what conditions a positive integer has a representation as a sum of two, three or four squares. About the second theme, we will prove that the mean number of representations of a positive integer as the sum of the squares of two integers is . To do so, we will introduce the function s 2 which associates an integer n with the cardinality of the set X n = {( a, b ) ∈ Z 2 ; a 2 + b 2 = n } and we will calculate the limit of its average value. Finally, as an analogy to the result regarding the mean value of s 2 , we will define the function s 3 , that associates a positive integer n with the cardinality of the set Y n = {( a, b, c ) ∈ Z 3 ; a 2 + b 2 + c 2 = n } and we will prove that there is no mean number of representations of a positive integer as the sum of the squares of three integers. |
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