Browsing Pure Mathematics Theses by Title
Now showing items 120 of 49

Adventures in applying iteration lemmas
(University of St Andrews, 20130628)  ThesisThe word problem of a finitely generated group is commonly defined to be a formal language over a finite generating set. The class of finite groups has been characterised as the class of finitely generated groups that ... 
Aspects of order and congruence relations on regular semigroups
(University of St Andrews, 1983)  ThesisOn a regular semigroup S natural order relations have been defined by Nambooripad and by Lallement. Different characterisations and relationships between the Nambooripad order J, Lallement's order λ and a certain relation ... 
Cayley automaton semigroups
(University of St Andrews, 20150626)  ThesisLet S be a semigroup, C(S) the automaton constructed from the right Cayley graph of S with respect to all of S as the generating set and ∑(C(S)) the automaton semigroup constructed from C(S). Such semigroups are ... 
Classification and enumeration of finite semigroups
(University of St Andrews, 20100623)  ThesisThe classification of finite semigroups is difficult even for small orders because of their large number. Most finite semigroups are nilpotent of nilpotency rank 3. Formulae for their number up to isomorphism, and up ... 
A commutative noncommutative fractal geometry
(University of St Andrews, 2010)  ThesisIn this thesis examples of spectral triples, which represent fractal sets, are examined and new insights into their noncommutative geometries are obtained. Firstly, starting with Connes' spectral triple for a nonempty ... 
Commutativity and free products in Thompson's group V
(University of St Andrews, 20180626)  ThesisWe broaden the theory of dynamical interpretation, investigate the property of commutativity and explore the subject of subgroups forming free products in Thompson's group V. We expand Brin's terminology for a revealing ... 
Computational techniques in finite semigroup theory
(University of St Andrews, 20190625)  ThesisA semigroup is simply a set with an associative binary operation; computational semigroup theory is the branch of mathematics concerned with developing techniques for computing with semigroups, as well as investigating ... 
Constructing 2generated subgroups of the group of homeomorphisms of Cantor space
(University of St Andrews, 2017)  ThesisWe study finite generation, 2generation and simplicity of subgroups of H[sub]c, the group of homeomorphisms of Cantor space. In Chapter 1 and Chapter 2 we run through foundational concepts and notation. In Chapter 3 we ... 
The construction of finite soluble factor groups of finitely presented groups and its application
(University of St Andrews, 1992)  ThesisComputational group theory deals with the design, analysis and computer implementation of algorithms for solving computational problems involving groups, and with the applications of the programs produced to interesting ... 
Counting subwords and other results related to the generalised starheight problem for regular languages
(University of St Andrews, 20171207)  ThesisThe Generalised StarHeight Problem is an open question in the field of formal language theory that concerns a measure of complexity on the class of regular languages; specifically, it asks whether or not there exists an ... 
Decision problems in groups of homeomorphisms of Cantor space
(University of St Andrews, 20181206)  ThesisThe Thompson groups $F, T$ and $V$ are important groups in geometric group theory: $T$ and $V$ being the first discovered examples of finitely presented infinite simple groups. There are many generalisations of these groups ... 
Dimension and measure theory of selfsimilar structures with no separation condition
(University of St Andrews, 20151130)  ThesisWe introduce methods to cope with selfsimilar sets when we do not assume any separation condition. For a selfsimilar set K ⊆ ℝᵈ we establish a similarity dimensionlike formula for Hausdorff dimension regardless of any ... 
Dimension theory and fractal constructions based on selfaffine carpets
(University of St Andrews, 20131129)  ThesisThe aim of this thesis is to develop the dimension theory of selfaffine carpets in several directions. Selfaffine carpets are an important class of planar selfaffine sets which have received a great deal of attention ... 
Dimension theory of random selfsimilar and selfaffine constructions
(University of St Andrews, 20170623)  ThesisThis thesis is structured as follows. Chapter 1 introduces fractal sets before recalling basic mathematical concepts from dynamical systems, measure theory, dimension theory and probability theory. In Chapter 2 we give ... 
Directed graph iterated function systems
(University of St Andrews, 20111130)  ThesisThis thesis concerns an active research area within fractal geometry. In the first part, in Chapters 2 and 3, for directed graph iterated function systems (IFSs) defined on ℝ, we prove that a class of 2vertex directed ... 
Dots and lines : geometric semigroup theory and finite presentability
(University of St Andrews, 20150626)  ThesisGeometric semigroup theory means different things to different people, but it is agreed that it involves associating a geometric structure to a semigroup and deducing properties of the semigroup based on that structure. ... 
Endomorphisms of Fraïssé limits and automorphism groups of algebraically closed relational structures
(University of St Andrews, 20121130)  ThesisLet Ω be the Fraïssé limit of a class of relational structures. We seek to answer the following semigroup theoretic question about Ω. What are the group Hclasses, i.e. the maximal subgroups, of End(Ω)? Fraïssé limits for ... 
Ends of semigroups
(University of St Andrews, 2013)  ThesisThe aim of this thesis is to understand the algebraic structure of a semigroup by studying the geometric properties of its Cayley graph. We define the notion of the partial order of ends of the Cayley graph of a semigroup. ... 
Finiteness conditions for unions of semigroups
(University of St Andrews, 20130628)  ThesisIn this thesis we prove the following: The semigroup which is a disjoint union of two or three copies of a group is a Clifford semigroup, Rees matrix semigroup or a combination between a Rees matrix semigroup and a ... 
Flatness, extension and amalgamation in monoids, semigroups and rings
(University of St Andrews, 1986)  ThesisWe begin our study of amalgamations by examining some ideas which are wellknown for the category of Rmodules. In particular we look at such notions as direct limits, pushouts, pullbacks, tensor products and flatness in ...