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Matrix Completions, Moments, and Sums of Hermitian Squares
  • Language: en
  • Pages: 533

Matrix Completions, Moments, and Sums of Hermitian Squares

Intensive research in matrix completions, moments, and sums of Hermitian squares has yielded a multitude of results in recent decades. This book provides a comprehensive account of this quickly developing area of mathematics and applications and gives complete proofs of many recently solved problems. With MATLAB codes and more than 200 exercises, the book is ideal for a special topics course for graduate or advanced undergraduate students in mathematics or engineering, and will also be a valuable resource for researchers. Often driven by questions from signal processing, control theory, and quantum information, the subject of this book has inspired mathematicians from many subdisciplines, in...

Realization of Vector Fields and Dynamics of Spatially Homogeneous Parabolic Equations
  • Language: en
  • Pages: 97

Realization of Vector Fields and Dynamics of Spatially Homogeneous Parabolic Equations

This book is intended for graduate students and research mathematicians working in partial differential equations.

Nonselfadjoint Operator Algebras, Operator Theory, and Related Topics
  • Language: en
  • Pages: 213

Nonselfadjoint Operator Algebras, Operator Theory, and Related Topics

  • Type: Book
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  • Published: 2012-12-06
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  • Publisher: Birkhäuser

This volume, dedicated to Carl Pearcy on the occasion of his 60th birthday, presents recent results in operator theory, nonselfadjoint operator algebras, measure theory and the theory of moments. The articles on these subjects have been contributed by leading area experts, many of whom were associated with Carl Pearcy as students or collaborators. The book testifies to his multifaceted interests and includes a biographical sketch and a list of publications.

Diffeomorphisms and Noncommutative Analytic Torsion
  • Language: en
  • Pages: 71

Diffeomorphisms and Noncommutative Analytic Torsion

This book is intended for graduate students and research mathematicians working in global analysis and analysis on manifolds

Estimating the Error of Numerical Solutions of Systems of Reaction-Diffusion Equations
  • Language: en
  • Pages: 125

Estimating the Error of Numerical Solutions of Systems of Reaction-Diffusion Equations

This paper is concerned with the computational estimation of the error of numerical solutions of potentially degenerate reaction-diffusion equations. The underlying motivation is a desire to compute accurate estimates as opposed to deriving inaccurate analytic upper bounds. In this paper, we outline, analyze, and test an approach to obtain computational error estimates based on the introduction of the residual error of the numerical solution and in which the effects of the accumulation of errors are estimated computationally. We begin by deriving an a posteriori relationship between the error of a numerical solution and its residual error using a variational argument. This leads to the intro...

Renormalized Self-Intersection Local Times and Wick Power Chaos Processes
  • Language: en
  • Pages: 138

Renormalized Self-Intersection Local Times and Wick Power Chaos Processes

Sufficient conditions are obtained for the continuity of renormalized self-intersection local times for the multiple intersections of a large class of strongly symmetric L vy processes in $R DEGREESm$, $m=1,2$. In $R DEGREES2$ these include Brownian motion and stable processes of index greater than 3/2, as well as many processes in their domains of attraction. In $R DEGREES1$ these include stable processes of index $3/4

Asymptotics for Solutions of Linear Differential Equations Having Turning Points with Applications
  • Language: en
  • Pages: 105

Asymptotics for Solutions of Linear Differential Equations Having Turning Points with Applications

Asymptotics are built for the solutions $y_j(x, \lambda)$, $y_j DEGREES{(k)}(0, \lambda)=\delta_{j\, n-k}$, $0\le j, k+1\le n$ of the equation $L(y)=\lambda p(x)y, \quad x\in [0,1], $ where $L(y)$ is a linear differential operator of whatever order $n\ge 2$ and $p(x)$ is assumed to possess a finite number of turning points. The established asymptotics are afterwards applied to the study of: 1) the existence of infinite eigenvalue sequences for various multipoint boundary problems posed on $L(y)=\lambda p(x)y, \quad x\in [0,1], $, especially as $n=2$ and $n=3$ (let us be aware that the same method can be successfully applied on many occasions in case $n>3$ too) and 2) asymptotical distribution of the corresponding eigenvalue sequences on the

A New Construction of Homogeneous Quaternionic Manifolds and Related Geometric Structures
  • Language: en
  • Pages: 79

A New Construction of Homogeneous Quaternionic Manifolds and Related Geometric Structures

Let $V = {\mathbb R}^{p,q}$ be the pseudo-Euclidean vector space of signature $(p,q)$, $p\ge 3$ and $W$ a module over the even Clifford algebra $C\! \ell^0 (V)$. A homogeneous quaternionic manifold $(M,Q)$ is constructed for any $\mathfrak{spin}(V)$-equivariant linear map $\Pi : \wedge^2 W \rightarrow V$. If the skew symmetric vector valued bilinear form $\Pi$ is nondegenerate then $(M,Q)$ is endowed with a canonical pseudo-Riemannian metric $g$ such that $(M,Q,g)$ is a homogeneous quaternionic pseudo-Kahler manifold. If the metric $g$ is positive definite, i.e. a Riemannian metric, then the quaternionic Kahler manifold $(M,Q,g)$ is shown to admit a simply transitive solvable group of automo...

Elementary Operators And Applications: In Memory Of Domingo A Herroro - Proceedings Of The International Workshop
  • Language: en
  • Pages: 270

Elementary Operators And Applications: In Memory Of Domingo A Herroro - Proceedings Of The International Workshop

The aim of this first international conference entirely devoted to the theory of elementary operators and their interrelations with and applications to other fields was both to give a comprehensive overview of the development of the theory of elementary operators since its beginnings at the end of the last century as well as to discuss some of the recent research done in this area. The volume also includes applications to algebraic properties of linear mappings (on rings as well as on Banach algebras), or to mathematical physics, and connections to related fields such as multiparameter spectral theory.

Quantum Linear Groups and Representations of $GL_n({\mathbb F}_q)$
  • Language: en
  • Pages: 127

Quantum Linear Groups and Representations of $GL_n({\mathbb F}_q)$

We give a self-contained account of the results originating in the work of James and the second author in the 1980s relating the representation theory of GL[n(F[q) over fields of characteristic coprime to q to the representation theory of "quantum GL[n" at roots of unity. The new treatment allows us to extend the theory in several directions. First, we prove a precise functorial connection between the operations of tensor product in quantum GL[n and Harish-Chandra induction in finite GL[n. This allows us to obtain a version of the recent Morita theorem of Cline, Parshall and Scott valid in addition for p-singular classes. From that we obtain simplified treatments of various basic known facts...