# UNT Theses and Dissertations - Browse

1 - 24 of 278

## Absolute Continuity and the Integration of Bounded Set Functions

Description: The first chapter gives basic definitions and theorems concerning set functions and set function integrals. The lemmas and theorems are presented without proof in this chapter. The second chapter deals with absolute continuity and Lipschitz condition. Particular emphasis is placed on the properties of max and min integrals. The third chapter deals with approximating absolutely continuous functions with bounded functions. It also deals with the existence of the integrals composed of various combinations of bounded functions and finitely additive functions. The concluding theorem states if the integral of the product of a bounded function and a non-negative finitely additive function exists, then the integral of the product of the bounded function with an absolutely continuous function exists over any element in a field of subsets of a set U.
Date: May 1975
Creator: Allen, John Houston
Partner: UNT Libraries

## Abstract Measure

Description: This study of abstract measure covers classes of sets, measures and outer measures, extension of measures, and planer measure.
Date: 1957
Creator: Bridges, Robert Miller
Partner: UNT Libraries

## Abstract Vector Spaces and Certain Related Systems

Description: The purpose of this paper is to make a detailed study of vector spaces and a certain vector-like system.
Date: August 1961
Creator: Goddard, Alton Ray
Partner: UNT Libraries

Description: The purpose of this paper is the analysis of functions of real numbers which have a special additive property, namely, f(x+y) = f(x)+f(y).
Date: June 1963
Creator: McNeir, Ridge W.
Partner: UNT Libraries

## Algebraic Integers

Description: The primary purpose of this thesis is to give a substantial generalization of the set of integers Z, where particular emphasis is given to number theoretic questions such as that of unique factorization. The origin of the thesis came from a study of a special case of generalized integers called the Gaussian Integers, namely the set of all complex numbers in the form n + mi, for m,n in Z. The main generalization involves what are called algebraic integers.
Date: August 1969
Creator: Black, Alvin M.
Partner: UNT Libraries

## Algebraic Properties of Semigroups

Description: This paper is an algebraic study of selected properties of semigroups. Since a semigroup is a result of weakening the group axioms, all groups are semigroups. One facet of the paper is to demonstrate various semigroup properties that induce the group axioms.
Date: May 1971
Creator: Lumley, Robert Don
Partner: UNT Libraries

## A*-algebras and Minimal Ideals in Topological Rings

Description: The present thesis mainly concerns B*-algebras, A*-algebras, and minimal ideals in topological rings.
Date: May 1973
Creator: Wei, Jui-Hung
Partner: UNT Libraries

## Algorithms of Schensted and Hillman-Grassl and Operations on Standard Bitableaux

Description: In this thesis, we describe Schensted's algorithm for finding the length of a longest increasing subsequence of a finite sequence. Schensted's algorithm also constructs a bijection between permutations of the first N natural numbers and standard bitableaux of size N. We also describe the Hillman-Grassl algorithm which constructs a bijection between reverse plane partitions and the solutions in natural numbers of a linear equation involving hook lengths. Pascal programs and sample output for both algorithms appear in the appendix. In addition, we describe the operations on standard bitableaux corresponding to the operations of inverting and reversing permutations. Finally, we show that these operations generate the dihedral group D_4
Date: August 1983
Creator: Sutherland, David C. (David Craig)
Partner: UNT Libraries

## The Analogues for t-Continuity of Certain Theorems on Ordinary Continuity

Description: This study investigates the relationship between ordinary continuity and t-continuity.
Date: 1941
Creator: Parrish, Herbert C.
Partner: UNT Libraries

## The Analytical Development of the Trigonometric Functions

Description: This thesis is a study of the analytical development of the trigonometric functions.
Date: 1951
Creator: Mackey, Pearl Cherrington
Partner: UNT Libraries

## Applications in Fixed Point Theory

Description: Banach's contraction principle is probably one of the most important theorems in fixed point theory. It has been used to develop much of the rest of fixed point theory. Another key result in the field is a theorem due to Browder, GÃ¶hde, and Kirk involving Hilbert spaces and nonexpansive mappings. Several applications of Banach's contraction principle are made. Some of these applications involve obtaining new metrics on a space, forcing a continuous map to have a fixed point, and using conditions on the boundary of a closed ball in a Banach space to obtain a fixed point. Finally, a development of the theorem due to Browder et al. is given with Hilbert spaces replaced by uniformly convex Banach spaces.
Date: December 2005
Creator: Farmer, Matthew Ray
Partner: UNT Libraries

## An Approximate Solution to the Dirichlet Problem

Description: In the category of mathematics called partial differential equations there is a particular type of problem called the Dirichlet problem. Proof is given in many partial differential equation books that every Dirichlet problem has one and only one solution. The explicit solution is very often not easily determined, so that a method for approximating the solution at certain points becomes desirable. The purpose of this paper is to present and investigate one such method.
Date: August 1964
Creator: Redwine, Edward William
Partner: UNT Libraries

## Atmospheric Gusts and Their Effect on Aircraft

Description: This thesis investigates atmospheric gusts and their effect on aircraft.
Date: August 1958
Creator: Walling, Waunnetta Keene
Partner: UNT Libraries

## Automorphism Groups

Description: This paper will be concerned mainly with automorphisms of groups. The concept of a group endomorphism will be used at various points in this paper.
Date: August 1965
Creator: Edwards, Donald Eugene
Partner: UNT Libraries

## Axiom of Choice Equivalences and Some Applications

Description: In this paper several equivalences of the axiom of choice are examined. In particular, the axiom of choice, Zorn's lemma, Tukey's lemma, the Hausdorff maximal principle, and the well-ordering theorem are shown to be equivalent. Cardinal and ordinal number theory is also studied. The Schroder-Bernstein theorem is proven and used in establishing order results for cardinal numbers. It is also demonstrated that the first uncountable ordinal space is unique up to order isomorphism. We conclude by encountering several applications of the axiom of choice. In particular, we show that every vector space must have a Hamel basis and that any two Hamel bases for the same space must have the same cardinality. We establish that the Tychonoff product theorem implies the axiom of choice and see the use of the axiom of choice in the proof of the Hahn- Banach theorem.
Date: August 1983
Creator: Race, Denise T. (Denise Tatsch)
Partner: UNT Libraries

## Basic Fourier Transforms

Description: The purpose of this paper is to develop some of the more basic Fourier transforms which are the outgrowth of the Fourier theorem. Although often approached from the stand-point of the series, this paper will approach the theorem from the standpoint of the integral.
Date: January 1962
Creator: Cumbie, James Randolph
Partner: UNT Libraries

## Borel Determinacy and Metamathematics

Description: Borel determinacy states that if G(T;X) is a game and X is Borel, then G(T;X) is determined. Proved by Martin in 1975, Borel determinacy is a theorem of ZFC set theory, and is, in fact, the best determinacy result in ZFC. However, the proof uses sets of high set theoretic type (N1 many power sets of Ï‰). Friedman proved in 1971 that these sets are necessary by showing that the Axiom of Replacement is necessary for any proof of Borel Determinacy. To prove this, Friedman produces a model of ZC and a Borel set of Turing degrees that neither contains nor omits a cone; so by another theorem of Martin, Borel Determinacy is not a theorem of ZC. This paper contains three main sections: Martin's proof of Borel Determinacy; a simpler example of Friedman's result, namely, (in ZFC) a coanalytic set of Turing degrees that neither contains nor omits a cone; and finally, the Friedman result.
Date: December 2001
Creator: Bryant, Ross
Partner: UNT Libraries

## Borel Sets and Baire Functions

Description: This paper examines the relationship between Borel sets and Baire functions.
Date: January 1970
Creator: Wemple, Fred W.
Partner: UNT Libraries

## The Buckling of a Uniformly Compressed Plate with Intermediate Supports

Description: This problem has been selected from the mathematical theory of elasticity. We consider a rectangular plate of thickness h, length a, and width b. The plate is subjected to compressive forces. These forces act in the neutral plane and give the plate a tendency to buckle. However, this problem differs from other plate problems in that it is assumed that there are two intermediate supports located on the edges of the plate parallel to the compressive forces.
Date: 1949
Creator: Dean, Thomas S.
Partner: UNT Libraries

## The Cantor Ternary Set and Certain of its Generalizations and Applications

Description: This thesis covers the Cantor Ternary Set and generalizations of the Cantor Set, and gives a complete existential theory for three set properties: denumerability, exhaustibility, and zero measure.
Date: 1942
Creator: Hembree, Gwendolyn
Partner: UNT Libraries

## Certain Properties of Functions Related to Exhaustibility

Description: In this thesis, we shall attempt to present a study of certain properties of real functions related to the set property exhaustible.
Date: 1952
Partner: UNT Libraries

## Characterizations of Continua of Finite Degree

Description: In this thesis, some characterizations of continua of finite degree are given. It turns out that being of finite degree (by formal definition) can be described by saying there exists an equivalent metric in which Hausdorff linear measure of the continuum is finite. I discuss this result in detail.
Date: August 2006
Creator: Irwin, Shana
Partner: UNT Libraries

## Chebyshev Subsets in Smooth Normed Linear Spaces

Description: This paper is a study of the relation between smoothness of the norm on a normed linear space and the property that every Chebyshev subset is convex. Every normed linear space of finite dimension, having a smooth norm, has the property that every Chebyshev subset is convex. In the second chapter two properties of the norm, uniform Gateaux differentiability and uniform Frechet differentiability where the latter implies the former, are given and are shown to be equivalent to smoothness of the norm in spaces of finite dimension. In the third chapter it is shown that every reflexive normed linear space having a uniformly Gateaux differentiable norm has the property that every weakly closed Chebyshev subset, with non-empty weak interior that is norm-wise dense in the subset, is convex.
Date: December 1974
Creator: Svrcek, Frank J.
Partner: UNT Libraries

## A Classification of Regular Planar Graphs

Description: The purpose of this paper is the investigation and classification of regular planar graphs. The motive behind this investigation was a desire to better understand those properties which allow a graph to be represented in the plane in such a manner that no two edges cross except perhaps at vertices.
Date: December 1972
Creator: McCalla, Linda F.
Partner: UNT Libraries