Now showing items 1-20 of 399

• #### Interaction energies, lattices, and designs ﻿

(Georgia Institute of Technology, 2020-05-21)
This thesis has four chapters. The ﬁrst three concern the location of mass on spheres or projective space, to minimize energies. For the Columb potential on the unit sphere, this is a classical problem, related to arranging ...
• #### Rayleigh-Taylor instability with heat transfer ﻿

(Georgia Institute of Technology, 2020-05-13)
In this thesis, the Rayleigh-Taylor instability effect with heat transfer in the setting of the Navier-Stokes equations, given three-dimensional and incompressible fluids, is investigated. Under suitable initial and boundary ...
• #### Numerical estimates for arm exponents and the acceptance profile in two-dimensional invasion percolation ﻿

(Georgia Institute of Technology, 2020-05-05)
The main object of this thesis is to numerically estimate some conjectured arm exponents when there exist a number of open paths and closed dual paths that extend to the boundary of different sizes of boxes centering at ...
• #### Finding and certifying numerical roots of systems of equations ﻿

(Georgia Institute of Technology, 2020-05-01)
Numerical algebraic geometry studies methods to approach problems in algebraic geometry numerically. Especially, finding roots of systems of equations using theory in algebraic geometry involves symbolic algorithm which ...
• #### Small torsion generating sets for mapping class groups ﻿

(Georgia Institute of Technology, 2020-04-27)
A surface of genus g has many symmetries. These form the surface’s mapping class group Mod(S_g), which is finitely generated. The most commonly used generating sets for Mod(S_g) are comprised of infinite order elements ...
• #### The Maxwell-Pauli equations ﻿

(Georgia Institute of Technology, 2020-03-19)
We study the quantum mechanical many-body problem of N ≥ 1 non-relativistic electrons with spin interacting with their self-generated classical electromagnetic field and K ≥ 0 static nuclei. We model the dynamics of the ...
• #### Randomness as a tool for modeling and uncovering structure ﻿

(Georgia Institute of Technology, 2020-03-12)
This thesis contains four main research directions, united by the themes of using randomness to (i) construct structure and (ii) uncover structure. Randomness has long been used for these tasks. Random models are defined ...
• #### 6-connected graphs are two-three linked ﻿

(Georgia Institute of Technology, 2019-11-11)
Let $G$ be a graph and $a_0, a_1, a_2, b_1,$ and $b_2$ be distinct vertices of $G$. Motivated by their work on Four Color Theorem, Hadwiger's conjecture for $K_6$, and J\o rgensen's conjecture, Robertson and Seymour asked ...
• #### The proxy point method for rank-structured matrices ﻿

(Georgia Institute of Technology, 2019-11-06)
Rank-structured matrix representations, e.g., $\mathcal{H}^2$ and HSS, are commonly used to reduce computation and storage cost for dense matrices defined by interactions between many bodies. The main bottleneck for their ...
• #### Topics on the length of the longest common subsequences, with blocks, in binary random words ﻿

(Georgia Institute of Technology, 2019-08-27)
The study of LIn, the length of the longest increasing subsequences, and of LCIn, the length of the longest common and increasing subsequences in random words is classical in computer science and bioinformatics, and has ...
• #### Quantum torus methods for Kauffman bracket skein modules ﻿

(Georgia Institute of Technology, 2019-08-22)
We investigate aspects of Kauffman bracket skein algebras of surfaces and modules of 3-manifolds using quantum torus methods. These methods come in two flavors: embedding the skein algebra into a quantum torus related to ...
• #### Lattice points, oriented matroids, and zonotopes ﻿

(Georgia Institute of Technology, 2019-07-26)
The first half of this dissertation concerns the following problem: Given a lattice in R^d which refines the integer lattice Z^d, what can be said about the distribution of the lattice points inside of the half-open unit ...
• #### The polaron hydrogenic atom in a strong magnetic field ﻿

(Georgia Institute of Technology, 2019-07-19)
It is shown that: (1) The ground-state electron density of a polaron bound in a Coulomb potential and exposed to a homogeneous magnetic field of strength B–with its transverse electron coordinates integrated out and when ...
• #### On the independent spanning tree conjectures and related problems ﻿

(Georgia Institute of Technology, 2019-07-17)
We say that trees with common root are (edge-)independent if, for any vertex in their intersection, the paths to the root induced by each tree are internally (edge-)disjoint. The relationship between graph (edge-)connectivity ...
• #### On a classical solution to the master equation of a first order mean field game ﻿

(Georgia Institute of Technology, 2019-07-11)
For a first order (deterministic) mean-field game with nonlocal couplings, a classical solution is constructed for the associated, so-called master equation, a partial differential equation in infinite- dimensional space ...
• #### Topics in dynamical systems ﻿

(Georgia Institute of Technology, 2019-06-14)
The thesis consists of two parts. the first one is dealing with isosspectral transformations and the second one with the phenomenon of local immunodeficiency. Isospectral transformations (IT) of matrices and networks allow ...
• #### The applications of discrete optimal transport in path planning and data clustering ﻿

(Georgia Institute of Technology, 2019-05-15)
Optimal transport introduces the concept of Wasserstein distance, which has been widely used in various applications in computational mathematics, machine learning as well as many areas in engineering. Meanwhile, control ...
• #### Percolation theory: The complement of the infinite cluster & the acceptance profile of the invasion percolation ﻿

(Georgia Institute of Technology, 2019-05-07)
In independent bond percolation with parameter p, if one removes the vertices of the infinite cluster (and incident edges), for which values of p does the remaining graph contain an infinite cluster? Grimmett-Holroyd-Kozma ...
• #### Text-classification methods and the mathematical theory of Principal Components ﻿

(Georgia Institute of Technology, 2019-04-22)
This thesis studies three topics. First of all, in text classification, one may use Principal Components Analysis (PCA) as a dimension reduction technique, or with few topics even as unsupervised classification method. We ...
• #### Coloring graphs with no k5-subdivision: disjoint paths in graphs ﻿

(Georgia Institute of Technology, 2019-03-27)
The Four Color Theorem states that every planar graph is 4-colorable. Hajos conjectured that for any positive integer k, every graph containing no K_{k+1}-subdivision is k-colorable. However, Catlin disproved Hajos conjecture ...