Publication Date
Fall 2018
Degree Type
Thesis
Degree Name
Master of Science (MS)
Department
Mathematics and Statistics
Advisor
Jordan Schettler
Subject Areas
Mathematics
Abstract
Let $K$ be a number field and let $\OO_K$ denote its ring of integers. We can define a graph whose vertices are the elements of $\OO_K$ such that an edge exists between two algebraic integers if their difference is in the units $\OO_K^{\times}$. Lenstra showed that the existence of a sufficiently large clique (complete subgraph) will imply that the ring $\OO_K$ is Euclidean with respect to the field norm. A recent generalization of this work tells us that if we draw more edges in the graph, then a sufficiently large clique will imply the weaker (but still very interesting) conclusion that $K$ has class number one.
This thesis aims to understand this new result and produce further examples of cliques in rings of integers. Lenstra, Long, and Thistlethwaite analyzed cliques and gave us class number one through a prime element. We were able to extend and generalize their result to larger cliques through prime power elements while still preserving our desired property of class number one. Our generalization gave us that class number one is preserved if the number field $K$ contained a clique that is generated by a prime power.
Recommended Citation
Lopez, Daniel S., "Lenstra-Hurwitz Cliques In Real Quadratic Fields" (2018). Master's Theses. 4974.
DOI: https://doi.org/10.31979/etd.3bc5-77v2
https://scholarworks.sjsu.edu/etd_theses/4974