<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="static/style.xsl"?><OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd"><responseDate>2026-09-25T12:46:04Z</responseDate><request verb="GetRecord" identifier="oai:repositorioaberto.uab.pt:10400.2/4420" metadataPrefix="dim">https://repositorioaberto.uab.pt/server/oai/request</request><GetRecord><record><header><identifier>oai:repositorioaberto.uab.pt:10400.2/4420</identifier><datestamp>2025-01-15T17:08:13Z</datestamp><setSpec>com_10400.2_15393</setSpec><setSpec>com_10400.2_15392</setSpec><setSpec>col_10400.2_1436</setSpec></header><metadata><dim:dim xmlns:dim="http://www.dspace.org/xmlns/dspace/dim" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:doc="http://www.lyncode.com/xoai" xsi:schemaLocation="http://www.dspace.org/xmlns/dspace/dim http://www.dspace.org/schema/dim.xsd">
   <dim:field mdschema="dc" element="contributor" qualifier="advisor">Edmundo, Mário Jorge</dim:field>
   <dim:field mdschema="dc" element="contributor" qualifier="advisor">Mamino, Marcelo</dim:field>
   <dim:field mdschema="dc" element="contributor" qualifier="author">Raimundo, António Pedro da Silva</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="accessioned">2015-07-28T16:20:11Z</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="available">2015-07-28T16:20:11Z</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="issued">2014</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="citation" lang="por">Raimundo, António Pedro da Silva - 10º problema de Hilbert para subanéis de Q [Em linha]. Lisboa : [s.n.], 2014. 90 p.</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="uri">http://hdl.handle.net/10400.2/4420</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="uri">urn:tid:201138956</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="tid">201138956</dim:field>
   <dim:field mdschema="dc" element="description" lang="por">Dissertação de Mestrado em Estatística, Matemática e Computação apresentada à Universidade Aberta</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="abstract" lang="por">Nesta dissertação estudamos o artigo de Bjorn Poonen [Poo03b], Hilbert‘s tenth problem and Mazur‘s conjecture&#xd;
for large subrings of Q e investigamos computacionalmente os diversos conjuntos caracterizados no&#xd;
artigo.&#xd;
Começamos por introduzir a teoria referente às variedades algébricas e às curvas elípticas , conceitos necessários&#xd;
ao entendimento do artigo em estudo.&#xd;
No artigo de Poonen é demonstrada a inexistência dum algoritmo para decidir se equações polinomiais com&#xd;
coeficientes em certos subanéis de Q têm ou não solução nesses subanéis ou seja o 10o problema de Hilbert&#xd;
para esses anéis tem uma solução negativa. A ideia da prova é a partir duma curva elíptica construir um modelo&#xd;
diofantino do anel Z. Com esse fim, partindo duma curva elíptica estuda-se alguns conjuntos infinitos&#xd;
de números primos que são recursivos.&#xd;
Na parte prática da dissertação definimos alguns algoritmos e calculamos alguns elementos destes conjuntos.</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="abstract" lang="por">This thesis studies the article Bjorn Poonen, Hilbert‘s tenth problem and Mazur‘s conjecture for large subrings&#xd;
of Q and investigates computationally the various sets featured in the article. We begin by introducing&#xd;
the basic theory of algebraic varieties and elliptic curves, concepts necessary for understanding the article&#xd;
under consideration. In Poonen article the absence of an algorithm to decide if polynomial equations with&#xd;
coefficients in certain subrings of Q have solutions in those subrings is proved, that is, Hilbert‘s tenth problemfor&#xd;
these rings has a negative solution. The idea of proof is to use an elliptic curve to build a diophantine&#xd;
model of the ring Z. To this end, we study some infinite recursive sets of primes that are built from an elliptic&#xd;
curve.&#xd;
The idea of proof is of an elliptic curve from building a diophantine model of the Z ring To this end, and&#xd;
from a elliptic curve is studied some infinite sets of primes that are recursive. In the practical part of the&#xd;
thesis we define algorithms and calculate some elements of these sets.</dim:field>
   <dim:field mdschema="dc" element="language" qualifier="iso" lang="por">por</dim:field>
   <dim:field mdschema="dc" element="subject" lang="por">Matemática</dim:field>
   <dim:field mdschema="dc" element="subject" lang="por">Estatística</dim:field>
   <dim:field mdschema="dc" element="subject" lang="por">Computação</dim:field>
   <dim:field mdschema="dc" element="subject" lang="por">Algorítmos</dim:field>
   <dim:field mdschema="dc" element="subject" lang="por">Álgebra</dim:field>
   <dim:field mdschema="dc" element="subject" lang="por">Curvas elípticas</dim:field>
   <dim:field mdschema="dc" element="subject" lang="por">Hilbert‘s tenth problem</dim:field>
   <dim:field mdschema="dc" element="subject" lang="por">Diophantine model</dim:field>
   <dim:field mdschema="dc" element="subject" lang="por">Elliptic curve</dim:field>
   <dim:field mdschema="dc" element="title" lang="por">10º problema de Hilbert para subanéis de Q</dim:field>
   <dim:field mdschema="dc" element="type">master thesis</dim:field>
   <dim:field mdschema="dspace" element="entity" qualifier="type">Publication</dim:field>
   <dim:field mdschema="rcaap" element="rights" lang="por">openAccess</dim:field>
   <dim:field mdschema="rcaap" element="type" lang="por">masterThesis</dim:field>open.access</dim:dim></metadata></record></GetRecord></OAI-PMH>