Now showing items 6-25 of 32

• #### Boundary conditions associated with left-definite theory and the spectral analysis of iterated rank-one perturbations. ﻿

(2018-05-24)
This dissertation details the development of several analytic tools that are used to apply the techniques and concepts of perturbation theory to other areas of analysis. The main application is an efficient characterization ...
• #### Boundary data smoothness for solutions of nonlocal boundary value problems. ﻿

(Mathematical Sciences Publishers.International Publications.Academic Publications., 2011)
In this dissertation, we investigate boundary data smoothness for solutions of nonlocal boundary value problems over discrete and continuous domains. Essentially, we show that under certain conditions partial derivatives ...
• #### Chaotic properties of set-valued dynamical systems. ﻿

(2016-04-04)
In this thesis, many classical results of topological dynamics are adapted to the set-valued case. In particular, focus is given to the notions of topological entropy and the specification property. These properties are ...
• #### A combinatorial property of Bernstein-Gelfand-Gelfand resolutions of unitary highest weight modules. ﻿

(, 2013-09-24)
It follows from a formula by Kostant that the difference between the highest weights of consecutive parabolic Verma modules in the Bernstein-Gelfand-Gelfand-Lepowsky resolution of the trivial representation is a single ...
• #### Comparison of smallest eigenvalues and extremal points for third and fourth order three point boundary value problems. ﻿

(, 2011-09-14)
The theory of u₀-positive operators with respect to a cone in a Banach space is applied to the linear differential equations u⁽⁴⁾ + λ₁p(x)u = 0 and u⁽⁴⁾ + λ₂q(x)u = 0, 0 ≤ x ≤ 1, with each satisfying the boundary conditions ...
• #### Conventional and asymptotic stabilities of decomposed compact methods for solving highly oscillatory wave problems. ﻿

(2018-07-12)
This dissertation explores the numerical stabilities of decomposed compact finite difference methods for solving Helmholtz partial differential equation problems with large wave numbers. It is known that many practically ...
• #### Diagrams and reduced decompositions for cominuscule flag varieties and affine Grassmannians. ﻿

(2010-06-23)
We develop a system of canonical reduced decompositions of minimal coset representatives of quotients corresponding to cominuscule flag varieties and affine Grassmannians. This canonical decomposition allows, in the first ...
• #### Eigenvalue comparison theorems for certain boundary value problems and positive solutions for a fifth order singular boundary value problem. ﻿

(2016-03-23)
Comparison of smallest eigenvalues for certain two point boundary value problems for a fifth order linear differential equation are first obtained. The results are extended to (2n+1)-order and (3n+2)-order boundary value ...
• #### Existence and uniqueness of solutions of boundary value problems by matching solutions. ﻿

(, 2013-09-24)
In this dissertation, we investigate the existence and uniqueness of boundary value problems for the third and nth order differential equations by matching solutions. Essentially, we consider the interval [a, c] of a BVP ...
• #### Existence of positive solutions to right focal three point singular boundary value problems. ﻿

(, 2013-09-16)
In this dissertation, we prove the existence of positive solutions to two classes of three point right focal singular boundary value problems of at least fourth order.
• #### Existence of positive solutions to singular right focal boundary value problems. ﻿

(Orlando, FL : International Publications., 2005-05)
In this dissetation, we seek positive solutions for the n^th order ordinary differential equation, y^(n)=f(x,y), satisfying the right focal boundary conditions, y^(i)(0)=y^(n-2)(p)=y^(n-1)(1)=0, i=0,...,n-3, where p is a ...
• #### Glazman-Krein-Naimark theory, left-definite theory, and the square of the Legendre polynomials differential operator. ﻿

(2016-02-27)
As an application of a general left-definite spectral theory, Everitt, Littlejohn and Wellman, in 2002, developed the left-definite theory associated with the classical Legendre self-adjoint second-order differential ...
• #### Global SL(2,R) representations of the Schrödinger equation with time-dependent potentials. ﻿

(, 2012-08-08)
We study the representation theory of the solution space of the one-dimensional Schrödinger equation with time-dependent potentials that possess sl₂-symmetry. We give explicit local intertwining maps to multiplier ...
• #### Indecomposability in inverse limits. ﻿

(2010-10-08)
Topological inverse limits play an important in the theory of dynamical systems and in continuum theory. In this dissertation, we investigate classical inverse limits of Julia sets and set-valued inverse limits of arbitrary ...
• #### Krylov methods for solving a sequence of large systems of linear equations. ﻿

(2015-07-22)
Consider solving a sequence of linear systems A_{(i)}x^{(i)}=b^{(i)}, i=1, 2, ... where A₍ᵢ₎ ϵℂⁿᵡⁿ and b⁽ⁱ⁾ϵℂⁿ using some variations of Krylov subspace methods, like GMRES. For a single system Ax=b, it is well-known that ...
• #### The left-definite spectral analysis of the legendre type differential equation. ﻿

(2010-02-02)
Littlejohn and Wellman developed a general abstract left-definite theory for a self-adjoint operator A that is bounded below in a Hilbert space (H,(‧,‧)). More specifically, they construct a continuum of Hilbert spaces ...
• #### Local automorphisms of finitary incidence algebras. ﻿

(2017-07-07)
Let $R$ be a commutative, indecomposable ring with identity and let $(P,\le)$ be a locally finite partially ordered set. Let $FI(P)$ denote the finitary incidence algebra of $(P,\le)$ over $R$. In this case, the finitary ...
• #### On a ring associated to F[x]. ﻿

(, 2013-09-24)
For a ﬁeld F and the polynomial ring F [x] in a single indeterminate, we deﬁne Ḟ [x] = {α ∈ End_F(F [x]) : α(ƒ) ∈ ƒF [x] for all ƒ ∈ F [x]}. Then Ḟ [x] is naturally isomorphic to F [x] if and only if F is inﬁnite. If F ...
• #### Orbit structures of homeomorphisms. ﻿

(, 2012-11-29)
In this dissertation we answer the following question: If X is a Cantor set and T: X → to X is a homeomorphism, what possible orbit structures can T have? The answer is given in terms of the orbit spectrum of T. If X is a ...
• #### Quadratic Lyapunov theory for dynamic linear switched systems. ﻿

(, 2014-01-28)
In this work, a special class of time-varying linear systems in the arbitrary time scale setting is examined by considering the qualitative properties of their solutions. Building on the work of J. DaCunha and A. Ramos, ...