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Author: Su Gao
Publisher: American Mathematical Soc.
ISBN: 1470418479
Category : Bernoulli numbers
Languages : en
Pages : 241
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Book Description
In this paper the authors study the dynamics of Bernoulli flows and their subflows over general countable groups. One of the main themes of this paper is to establish the correspondence between the topological and the symbolic perspectives. From the topological perspective, the authors are particularly interested in free subflows (subflows in which every point has trivial stabilizer), minimal subflows, disjointness of subflows, and the problem of classifying subflows up to topological conjugacy. Their main tool to study free subflows will be the notion of hyper aperiodic points; a point is hyper aperiodic if the closure of its orbit is a free subflow.
Author: Su Gao
Publisher: American Mathematical Soc.
ISBN: 1470418479
Category : Bernoulli numbers
Languages : en
Pages : 241
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Book Description
In this paper the authors study the dynamics of Bernoulli flows and their subflows over general countable groups. One of the main themes of this paper is to establish the correspondence between the topological and the symbolic perspectives. From the topological perspective, the authors are particularly interested in free subflows (subflows in which every point has trivial stabilizer), minimal subflows, disjointness of subflows, and the problem of classifying subflows up to topological conjugacy. Their main tool to study free subflows will be the notion of hyper aperiodic points; a point is hyper aperiodic if the closure of its orbit is a free subflow.
Author: Volodymyr Nekrashevych
Publisher: American Mathematical Society
ISBN: 1470471205
Category : Mathematics
Languages : en
Pages : 708
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Book Description
This book is devoted to group-theoretic aspects of topological dynamics such as studying groups using their actions on topological spaces, using group theory to study symbolic dynamics, and other connections between group theory and dynamical systems. One of the main applications of this approach to group theory is the study of asymptotic properties of groups such as growth and amenability. The book presents recently developed techniques of studying groups of dynamical origin using the structure of their orbits and associated groupoids of germs, applications of the iterated monodromy groups to hyperbolic dynamical systems, topological full groups and their properties, amenable groups, groups of intermediate growth, and other topics. The book is suitable for graduate students and researchers interested in group theory, transformations defined by automata, topological and holomorphic dynamics, and theory of topological groupoids. Each chapter is supplemented by exercises of various levels of complexity.
Author: Samuel Coskey
Publisher: American Mathematical Soc.
ISBN: 1470443325
Category : Education
Languages : en
Pages : 207
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Book Description
This volume contains the proceedings of Simon Fest, held in honor of Simon Thomas's 60th birthday, from September 15–17, 2017, at Rutgers University, Piscataway, New Jersey. The topics covered showcase recent advances from a variety of main areas of set theory, including descriptive set theory, forcing, and inner model theory, in addition to several applications of set theory, including ergodic theory, combinatorics, and model theory.
Author: Joseph Hundley
Publisher: American Mathematical Soc.
ISBN: 1470416670
Category : Descent
Languages : en
Pages : 125
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Book Description
In this paper the authors provide an extension of the theory of descent of Ginzburg-Rallis-Soudry to the context of essentially self-dual representations, that is, representations which are isomorphic to the twist of their own contragredient by some Hecke character. The authors' theory supplements the recent work of Asgari-Shahidi on the functorial lift from (split and quasisplit forms of) GSpin2n to GL2n.
Author: F. Dahmani
Publisher: American Mathematical Soc.
ISBN: 1470421941
Category : Hyperbolic groups
Languages : en
Pages : 154
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Book Description
he authors introduce and study the notions of hyperbolically embedded and very rotating families of subgroups. The former notion can be thought of as a generalization of the peripheral structure of a relatively hyperbolic group, while the latter one provides a natural framework for developing a geometric version of small cancellation theory. Examples of such families naturally occur in groups acting on hyperbolic spaces including hyperbolic and relatively hyperbolic groups, mapping class groups, , and the Cremona group. Other examples can be found among groups acting geometrically on spaces, fundamental groups of graphs of groups, etc. The authors obtain a number of general results about rotating families and hyperbolically embedded subgroups; although their technique applies to a wide class of groups, it is capable of producing new results even for well-studied particular classes. For instance, the authors solve two open problems about mapping class groups, and obtain some results which are new even for relatively hyperbolic groups.
Author: Matthew J. Emerton
Publisher: American Mathematical Soc.
ISBN: 0821875620
Category : Geometry, Analytic
Languages : en
Pages : 158
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Book Description
The goal of this memoir is to provide the foundations for the locally analytic representation theory that is required in three of the author's other papers on this topic. In the course of writing those papers the author found it useful to adopt a particular point of view on locally analytic representation theory: namely, regarding a locally analytic representation as being the inductive limit of its subspaces of analytic vectors (of various “radii of analyticity”). The author uses the analysis of these subspaces as one of the basic tools in his study of such representations. Thus in this memoir he presents a development of locally analytic representation theory built around this point of view. The author has made a deliberate effort to keep the exposition reasonably self-contained and hopes that this will be of some benefit to the reader.
Author: Rod Downey
Publisher: World Scientific
ISBN: 9814449288
Category : Mathematics
Languages : en
Pages : 348
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Book Description
The Asian Logic Conference is the most significant logic meeting outside of North America and Europe, and this volume represents work presented at, and arising from the 12th meeting. It collects a number of interesting papers from experts in the field. It covers many areas of logic. Contents:Resolute Sequences in Initial Segment Complexity (G Barmpalias and R G Downey)Approximating Functions and Measuring Distance on a Graph (W Calvert, R Miller and J Chubb Reimann)Carnap and McKinsey: Topics in the Pre-History of Possible-Worlds Semantics (M J Cresswell)Limits to Joining with Generics and Randoms (A R Day and D D Dzhafarov)Freedom & Consistency (M Detlefsen)A van Lambalgen Theorem for Demuth Randomness (D Diamondstone, N Greenberg and D Turetsky)Faithful Representations of Polishable Ideals (S Gao)Further Thoughts on Definability in the Urysohn Sphere (I Goldbring)Simple Completeness Proofs for Some Spatial Logics of the Real Line (I Hodkinson)On a Question of Csima on Computation-Time Domination (X Hua, J Liu and G Wu)A Generalization of Beth Model to Functionals of High Types (F Kachapova)A Computational Framework for the Study of Partition Functions and Graph Polynomials (T Kotek, J A Makowsky and E V Ravve)Relation Algebras and R (T Kowalski)Van Lambalgen's Theorem for Uniformly Relative Schnorr and Computable Randomness (K Miyabe and J Rute)Computational Aspects of the Hyperimmune-Free Degrees (K M Ng, F Stephan, Y Yang and L Yu)Calibrating the Complexity of Δ02 Sets via Their Changes (A Nies)Topological Full Groups of Minimal Subshifts and Just-Infnite Groups (S Thomas)TW-Models for Logic of Knowledge-cum-Belief (S C-M Yang) Readership: Researchers in mathematical logic and algebra, computer scientists in artificial intelligence and fuzzy logic. Keywords:Asian Logic Conference;Logic;Computability;Set Theory;Modal Logic
Author: Béla Csaba
Publisher: American Mathematical Soc.
ISBN: 1470420252
Category : 1-factorization
Languages : en
Pages : 164
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Book Description
In this paper the authors prove the following results (via a unified approach) for all sufficiently large n: (i) [1-factorization conjecture] Suppose that n is even and D≥2⌈n/4⌉−1. Then every D-regular graph G on n vertices has a decomposition into perfect matchings. Equivalently, χ′(G)=D. (ii) [Hamilton decomposition conjecture] Suppose that D≥⌊n/2⌋. Then every D-regular graph G on n vertices has a decomposition into Hamilton cycles and at most one perfect matching. (iii) [Optimal packings of Hamilton cycles] Suppose that G is a graph on n vertices with minimum degree δ≥n/2. Then G contains at least regeven(n,δ)/2≥(n−2)/8 edge-disjoint Hamilton cycles. Here regeven(n,δ) denotes the degree of the largest even-regular spanning subgraph one can guarantee in a graph on n vertices with minimum degree δ. (i) was first explicitly stated by Chetwynd and Hilton. (ii) and the special case δ=⌈n/2⌉ of (iii) answer questions of Nash-Williams from 1970. All of the above bounds are best possible.
Author: Xin-Rong Dai
Publisher: American Mathematical Soc.
ISBN: 1470420155
Category : Gabor frames
Languages : en
Pages : 99
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Book Description
A longstanding problem in Gabor theory is to identify time-frequency shifting lattices aZ×bZ and ideal window functions χI on intervals I of length c such that {e−2πinbtχI(t−ma): (m,n)∈Z×Z} are Gabor frames for the space of all square-integrable functions on the real line. In this paper, the authors create a time-domain approach for Gabor frames, introduce novel techniques involving invariant sets of non-contractive and non-measure-preserving transformations on the line, and provide a complete answer to the above abc-problem for Gabor systems.
Author: Reiner Hermann:
Publisher: American Mathematical Soc.
ISBN: 1470419955
Category : Associative rings
Languages : en
Pages : 146
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Book Description
In this monograph, the author extends S. Schwede's exact sequence interpretation of the Gerstenhaber bracket in Hochschild cohomology to certain exact and monoidal categories. Therefore the author establishes an explicit description of an isomorphism by A. Neeman and V. Retakh, which links Ext-groups with fundamental groups of categories of extensions and relies on expressing the fundamental group of a (small) category by means of the associated Quillen groupoid. As a main result, the author shows that his construction behaves well with respect to structure preserving functors between exact monoidal categories. The author uses his main result to conclude, that the graded Lie bracket in Hochschild cohomology is an invariant under Morita equivalence. For quasi-triangular bialgebras, he further determines a significant part of the Lie bracket's kernel, and thereby proves a conjecture by L. Menichi. Along the way, the author introduces n-extension closed and entirely extension closed subcategories of abelian categories, and studies some of their properties.
