You limited your search to:

  Partner: UNT Libraries
 Department: Department of Mathematics
 Collection: UNT Theses and Dissertations
A Generalization of the Weierstrass Approximation Theorem

A Generalization of the Weierstrass Approximation Theorem

Date: August 1972
Creator: Murchison, Jo Denton
Description: A presentation of the Weierstrass approximation theorem and the Stone-Weierstrass theorem and a comparison of these two theorems are the objects of this thesis.
Contributing Partner: UNT Libraries
A Generalized Study of the Conjugate and Inner-Product Functions

A Generalized Study of the Conjugate and Inner-Product Functions

Date: June 1967
Creator: Wright, Dorothy P.
Description: The usual practice in any discussion of an inner-product space is to restrict the field over which the inner-product space is defined to the field of complex numbers. In defining the inner-product function, (x,y), a second function is needed; namely the conjugate function (x,y)* so that (x,y) ± (y,x)*. We will attempt to generalize this concept by investigating the existence of a conjugate function defined on fields other than the field of complex numbers and relate this function to an inner-product function defined on a linear space L over these fields.
Contributing Partner: UNT Libraries
Generic Algebras and Kazhdan-Lusztig Theory for Monomial Groups

Generic Algebras and Kazhdan-Lusztig Theory for Monomial Groups

Access: Use of this item is restricted to the UNT Community.
Date: May 2006
Creator: Alhaddad, Shemsi I.
Description: The Iwahori-Hecke algebras of Coxeter groups play a central role in the study of representations of semisimple Lie-type groups. An important tool is the combinatorial approach to representations of Iwahori-Hecke algebras introduced by Kazhdan and Lusztig in 1979. In this dissertation, I discuss a generalization of the Iwahori-Hecke algebra of the symmetric group that is instead based on the complex reflection group G(r,1,n). Using the analogues of Kazhdan and Lusztig's R-polynomials, I show that this algebra determines a partial order on G(r,1,n) that generalizes the Chevalley-Bruhat order on the symmetric group. I also consider possible analogues of Kazhdan-Lusztig polynomials.
Contributing Partner: UNT Libraries
A Genesis for Compact Convex Sets

A Genesis for Compact Convex Sets

Date: May 1969
Creator: Ferguson, Ronald D.
Description: This paper was written in response to the following question: what conditions are sufficient to guarantee that if a compact subset A of a topological linear space L^3 is not convex, then for every point x belonging to the complement of A relative to the convex hull of A there exists a line segment yz such that x belongs to yz and y belongs to A and z belongs to A? Restated in the terminology of this paper the question bay be given as follow: what conditions may be imposed upon a compact subset A of L^3 to insure that A is braced?
Contributing Partner: UNT Libraries
Gibbs/Equilibrium Measures for Functions of Multidimensional Shifts with Countable Alphabets

Gibbs/Equilibrium Measures for Functions of Multidimensional Shifts with Countable Alphabets

Date: May 2011
Creator: Muir, Stephen R.
Description: Consider a multidimensional shift space with a countably infinite alphabet, which serves in mathematical physics as a classical lattice gas or lattice spin system. A new definition of a Gibbs measure is introduced for suitable real-valued functions of the configuration space, which play the physical role of specific internal energy. The variational principle is proved for a large class of functions, and then a more restrictive modulus of continuity condition is provided that guarantees a function's Gibbs measures to be a nonempty, weakly compact, convex set of measures that coincides with the set of measures obeying a form of the DLR equations (which has been adapted so as to be stated entirely in terms of specific internal energy instead of the Hamiltonians for an interaction potential). The variational equilibrium measures for a such a function are then characterized as the shift invariant Gibbs measures of finite entropy, and a condition is provided to determine if a function's Gibbs measures have infinite entropy or not. Moreover the spatially averaged limiting Gibbs measures, i.e. constructive equilibria, are shown to exist and their weakly closed convex hull is shown to coincide with the set of true variational equilibrium measures. It follows that the ...
Contributing Partner: UNT Libraries
The Global Structure of Iterated Function Systems

The Global Structure of Iterated Function Systems

Date: May 2009
Creator: Snyder, Jason Edward
Description: I study sets of attractors and non-attractors of finite iterated function systems. I provide examples of compact sets which are attractors of iterated function systems as well as compact sets which are not attractors of any iterated function system. I show that the set of all attractors is a dense Fs set and the space of all non-attractors is a dense Gd set it the space of all non-empty compact subsets of a space X. I also investigate the small trans-finite inductive dimension of the space of all attractors of iterated function systems generated by similarity maps on [0,1].
Contributing Partner: UNT Libraries
Graev Metrics and Isometry Groups of Polish Ultrametric Spaces

Graev Metrics and Isometry Groups of Polish Ultrametric Spaces

Date: May 2013
Creator: Shi, Xiaohui
Description: This dissertation presents results about computations of Graev metrics on free groups and characterizes isometry groups of countable noncompact Heine-Borel Polish ultrametric spaces. In Chapter 2, computations of Graev metrics are performed on free groups. One of the related results answers an open question of Van Den Dries and Gao. In Chapter 3, isometry groups of countable noncompact Heine-Borel Polish ultrametric spaces are characterized. The notion of generalized tree is defined and a correspondence between the isomorphism group of a generalized tree and the isometry group of a Heine-Borel Polish ultrametric space is established. The concept of a weak inverse limit is introduced to capture the characterization of isomorphism groups of generalized trees. In Chapter 4, partial results of isometry groups of uncountable compact ultrametric spaces are given. It turns out that every compact ultrametric space has a unique countable orbital decomposition. An orbital space consists of disjoint orbits. An orbit subspace of an orbital space is actually a compact homogeneous ultrametric subspace.
Contributing Partner: UNT Libraries
Hamiltonian cycles in subset and subspace graphs.

Hamiltonian cycles in subset and subspace graphs.

Access: Use of this item is restricted to the UNT Community.
Date: December 2004
Creator: Ghenciu, Petre Ion
Description: In this dissertation we study the Hamiltonicity and the uniform-Hamiltonicity of subset graphs, subspace graphs, and their associated bipartite graphs. In 1995 paper "The Subset-Subspace Analogy," Kung states the subspace version of a conjecture. The study of this problem led to a more general class of graphs. Inspired by Clark and Ismail's work in the 1996 paper "Binomial and Q-Binomial Coefficient Inequalities Related to the Hamiltonicity of the Kneser Graphs and their Q-Analogues," we defined subset graphs, subspace graphs, and their associated bipartite graphs. The main emphasis of this dissertation is to describe those graphs and study their Hamiltonicity. The results on subset graphs are presented in Chapter 3, on subset bipartite graphs in Chapter 4, and on subspace graphs and subspace bipartite graphs in Chapter 5. We conclude the dissertation by suggesting some generalizations of our results concerning the panciclicity of the graphs.
Contributing Partner: UNT Libraries
Helly-Type Theorems

Helly-Type Theorems

Date: August 1968
Creator: Davenport, Edward W.
Description: The purpose of this paper is to present two proofs of Helly's Theorem and to use it in the proofs of several theorems classified in a group called Helly-type theorems.
Contributing Partner: UNT Libraries
The History of the Calculus

The History of the Calculus

Date: 1945
Creator: Ashburn, Andrew
Description: The purpose of this essay is to trace the development of the concepts of the calculus from their first known appearance, through the formal invention of the method of the calculus in the second half of the seventeenth century, to our own day.
Contributing Partner: UNT Libraries