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A Unified Approach to Structural Limits and Limits of Graphs with Bounded Tree-Depth

A Unified Approach to Structural Limits and Limits of Graphs with Bounded Tree-Depth
Author: Jaroslav Nešetřil
Publisher: American Mathematical Soc.
Total Pages: 108
Release: 2020-04-03
Genre: Education
ISBN: 1470440652

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In this paper the authors introduce a general framework for the study of limits of relational structures and graphs in particular, which is based on a combination of model theory and (functional) analysis. The authors show how the various approaches to graph limits fit to this framework and that the authors naturally appear as “tractable cases” of a general theory. As an outcome of this, the authors provide extensions of known results. The authors believe that this puts these into a broader context. The second part of the paper is devoted to the study of sparse structures. First, the authors consider limits of structures with bounded diameter connected components and prove that in this case the convergence can be “almost” studied component-wise. They also propose the structure of limit objects for convergent sequences of sparse structures. Eventually, they consider the specific case of limits of colored rooted trees with bounded height and of graphs with bounded tree-depth, motivated by their role as “elementary bricks” these graphs play in decompositions of sparse graphs, and give an explicit construction of a limit object in this case. This limit object is a graph built on a standard probability space with the property that every first-order definable set of tuples is measurable. This is an example of the general concept of modeling the authors introduce here. Their example is also the first “intermediate class” with explicitly defined limit structures where the inverse problem has been solved.


Surveys in Combinatorics 2019

Surveys in Combinatorics 2019
Author: Allan Lo
Publisher: Cambridge University Press
Total Pages: 275
Release: 2019-06-27
Genre: Mathematics
ISBN: 1108631622

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This volume contains eight survey articles based on the invited lectures given at the 27th British Combinatorial Conference, held at the University of Birmingham in July 2019. This biennial conference is a well-established international event, with speakers from around the world. The volume provides an up-to-date overview of current research in several areas of combinatorics, including graph theory, cryptography, matroids, incidence geometries and graph limits. Each article is clearly written and assumes little prior knowledge on the part of the reader. The authors are some of the world's foremost researchers in their fields, and here they summarise existing results and give a unique preview of cutting-edge developments. The book provides a valuable survey of the present state of knowledge in combinatorics, and will be useful to researchers and advanced graduate students, primarily in mathematics but also in computer science and statistics.


Foundations of Software Science and Computation Structures

Foundations of Software Science and Computation Structures
Author: Jean Goubault-Larrecq
Publisher: Springer Nature
Total Pages: 644
Release: 2020-04-17
Genre: Mathematics
ISBN: 303045231X

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This open access book constitutes the proceedings of the 23rd International Conference on Foundations of Software Science and Computational Structures, FOSSACS 2020, which took place in Dublin, Ireland, in April 2020, and was held as Part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2020. The 31 regular papers presented in this volume were carefully reviewed and selected from 98 submissions. The papers cover topics such as categorical models and logics; language theory, automata, and games; modal, spatial, and temporal logics; type theory and proof theory; concurrency theory and process calculi; rewriting theory; semantics of programming languages; program analysis, correctness, transformation, and verification; logics of programming; software specification and refinement; models of concurrent, reactive, stochastic, distributed, hybrid, and mobile systems; emerging models of computation; logical aspects of computational complexity; models of software security; and logical foundations of data bases.​


Samson Abramsky on Logic and Structure in Computer Science and Beyond

Samson Abramsky on Logic and Structure in Computer Science and Beyond
Author: Alessandra Palmigiano
Publisher: Springer Nature
Total Pages: 1149
Release: 2023-09-02
Genre: Philosophy
ISBN: 3031241177

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Samson Abramsky’s wide-ranging contributions to logical and structural aspects of Computer Science have had a major influence on the field. This book is a rich collection of papers, inspired by and extending Abramsky’s work. It contains both survey material and new results, organised around six major themes: domains and duality, game semantics, contextuality and quantum computation, comonads and descriptive complexity, categorical and logical semantics, and probabilistic computation. These relate to different stages and aspects of Abramsky’s work, reflecting its exceptionally broad scope and his ability to illuminate and unify diverse topics. Chapters in the volume include a review of his entire body of work, spanning from philosophical aspects to logic, programming language theory, quantum theory, economics and psychology, and relating it to a theory of unification of sciences using dual adjunctions. The section on game semantics shows how Abramsky’s work has led to a powerful new paradigm for the semantics of computation. The work on contextuality and categorical quantum mechanics has been highly influential, and provides the foundation for increasingly widely used methods in quantum computing. The work on comonads and descriptive complexity is building bridges between currently disjoint research areas in computer science, relating Structure to Power. The volume also includes a scientific autobiography, and an overview of the contributions. The outstanding set of contributors to this volume, including both senior and early career academics, serve as testament to Samson Abramsky’s enduring influence. It will provide an invaluable and unique resource for both students and established researchers.


Extended Abstracts EuroComb 2021

Extended Abstracts EuroComb 2021
Author: Jaroslav Nešetřil
Publisher: Springer Nature
Total Pages: 875
Release: 2021-08-23
Genre: Mathematics
ISBN: 3030838234

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This book collects the extended abstracts of the accepted contributions to EuroComb21. A similar book is published at every edition of EuroComb (every two years since 2001) collecting the most recent advances in combinatorics, graph theory, and related areas. It has a wide audience in the areas, and the papers are used and referenced broadly.


Proceedings Of The International Congress Of Mathematicians 2018 (Icm 2018) (In 4 Volumes)

Proceedings Of The International Congress Of Mathematicians 2018 (Icm 2018) (In 4 Volumes)
Author: Sirakov Boyan
Publisher: World Scientific
Total Pages: 5396
Release: 2019-02-27
Genre: Mathematics
ISBN: 9813272899

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The Proceedings of the ICM publishes the talks, by invited speakers, at the conference organized by the International Mathematical Union every 4 years. It covers several areas of Mathematics and it includes the Fields Medal and Nevanlinna, Gauss and Leelavati Prizes and the Chern Medal laudatios.


Conformal Graph Directed Markov Systems on Carnot Groups

Conformal Graph Directed Markov Systems on Carnot Groups
Author: Vasileios Chousionis
Publisher: American Mathematical Soc.
Total Pages: 153
Release: 2020-09-28
Genre: Mathematics
ISBN: 1470442159

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The authors develop a comprehensive theory of conformal graph directed Markov systems in the non-Riemannian setting of Carnot groups equipped with a sub-Riemannian metric. In particular, they develop the thermodynamic formalism and show that, under natural hypotheses, the limit set of an Carnot conformal GDMS has Hausdorff dimension given by Bowen's parameter. They illustrate their results for a variety of examples of both linear and nonlinear iterated function systems and graph directed Markov systems in such sub-Riemannian spaces. These include the Heisenberg continued fractions introduced by Lukyanenko and Vandehey as well as Kleinian and Schottky groups associated to the non-real classical rank one hyperbolic spaces.


The Mother Body Phase Transition in the Normal Matrix Model

The Mother Body Phase Transition in the Normal Matrix Model
Author: Pavel M. Bleher
Publisher: American Mathematical Soc.
Total Pages: 144
Release: 2020-09-28
Genre: Mathematics
ISBN: 1470441845

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In this present paper, the authors consider the normal matrix model with cubic plus linear potential.


Global Smooth Solutions for the Inviscid SQG Equation

Global Smooth Solutions for the Inviscid SQG Equation
Author: Angel Castro
Publisher: American Mathematical Soc.
Total Pages: 89
Release: 2020-09-28
Genre: Mathematics
ISBN: 1470442140

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In this paper, the authors show the existence of the first non trivial family of classical global solutions of the inviscid surface quasi-geostrophic equation.


Affine Flag Varieties and Quantum Symmetric Pairs

Affine Flag Varieties and Quantum Symmetric Pairs
Author: Zhaobing Fan
Publisher: American Mathematical Soc.
Total Pages: 123
Release: 2020-09-28
Genre: Mathematics
ISBN: 1470441756

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The quantum groups of finite and affine type $A$ admit geometric realizations in terms of partial flag varieties of finite and affine type $A$. Recently, the quantum group associated to partial flag varieties of finite type $B/C$ is shown to be a coideal subalgebra of the quantum group of finite type $A$.