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A Geometric Theory for Hypergraph Matching

2014-12-20 Mathematics
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Release : 2014-12-20
Genre : Mathematics
Kind : eBook
Book Rating : 658/5 ( reviews)

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Book Synopsis A Geometric Theory for Hypergraph Matching by : Peter Keevash

Download or read book A Geometric Theory for Hypergraph Matching written by Peter Keevash. This book was released on 2014-12-20. Available in PDF, EPUB and Kindle. Book excerpt: The authors develop a theory for the existence of perfect matchings in hypergraphs under quite general conditions. Informally speaking, the obstructions to perfect matchings are geometric, and are of two distinct types: `space barriers' from convex geometry, and `divisibility barriers' from arithmetic lattice-based constructions. To formulate precise results, they introduce the setting of simplicial complexes with minimum degree sequences, which is a generalisation of the usual minimum degree condition. They determine the essentially best possible minimum degree sequence for finding an almost perfect matching. Furthermore, their main result establishes the stability property: under the same degree assumption, if there is no perfect matching then there must be a space or divisibility barrier. This allows the use of the stability method in proving exact results. Besides recovering previous results, the authors apply our theory to the solution of two open problems on hypergraph packings: the minimum degree threshold for packing tetrahedra in -graphs, and Fischer's conjecture on a multipartite form of the Hajnal-Szemerédi Theorem. Here they prove the exact result for tetrahedra and the asymptotic result for Fischer's conjecture; since the exact result for the latter is technical they defer it to a subsequent paper.

Recent Trends in Combinatorics

2016-04-12 Mathematics
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Release : 2016-04-12
Genre : Mathematics
Kind : eBook
Book Rating : 989/5 ( reviews)

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Book Synopsis Recent Trends in Combinatorics by : Andrew Beveridge

Download or read book Recent Trends in Combinatorics written by Andrew Beveridge. This book was released on 2016-04-12. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents some of the research topics discussed at the 2014-2015 Annual Thematic Program Discrete Structures: Analysis and Applications at the Institute for Mathematics and its Applications during Fall 2014, when combinatorics was the focus. Leading experts have written surveys of research problems, making state of the art results more conveniently and widely available. The three-part structure of the volume reflects the three workshops held during Fall 2014. In the first part, topics on extremal and probabilistic combinatorics are presented; part two focuses on additive and analytic combinatorics; and part three presents topics in geometric and enumerative combinatorics. This book will be of use to those who research combinatorics directly or apply combinatorial methods to other fields.

Theory and Applications of Models of Computation

2017-04-13 Mathematics
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Release : 2017-04-13
Genre : Mathematics
Kind : eBook
Book Rating : 117/5 ( reviews)

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Book Synopsis Theory and Applications of Models of Computation by : T.V. Gopal

Download or read book Theory and Applications of Models of Computation written by T.V. Gopal. This book was released on 2017-04-13. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 14th Annual Conference on Theory and Applications of Models of Computation, TAMC 2017, held in Bern, Switzerland, in April 2017. The 45 revised full papers presented together with 4 invited papers were carefully reviewed and selected from 103 submissions. The main themes of TAMC 2017 have been computability, computer science logic, complexity, algorithms, and models of computation and systems theory.

Geometric Complexity Theory IV: Nonstandard Quantum Group for the Kronecker Problem

2015-04-09 Mathematics
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Release : 2015-04-09
Genre : Mathematics
Kind : eBook
Book Rating : 117/5 ( reviews)

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Book Synopsis Geometric Complexity Theory IV: Nonstandard Quantum Group for the Kronecker Problem by : Jonah Blasiak

Download or read book Geometric Complexity Theory IV: Nonstandard Quantum Group for the Kronecker Problem written by Jonah Blasiak. This book was released on 2015-04-09. Available in PDF, EPUB and Kindle. Book excerpt: The Kronecker coefficient is the multiplicity of the -irreducible in the restriction of the -irreducible via the natural map , where are -vector spaces and . A fundamental open problem in algebraic combinatorics is to find a positive combinatorial formula for these coefficients. The authors construct two quantum objects for this problem, which they call the nonstandard quantum group and nonstandard Hecke algebra. They show that the nonstandard quantum group has a compact real form and its representations are completely reducible, that the nonstandard Hecke algebra is semisimple, and that they satisfy an analog of quantum Schur-Weyl duality.

The Seventh European Conference on Combinatorics, Graph Theory and Applications

2014-01-18 Mathematics
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Release : 2014-01-18
Genre : Mathematics
Kind : eBook
Book Rating : 75X/5 ( reviews)

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Book Synopsis The Seventh European Conference on Combinatorics, Graph Theory and Applications by : Jaroslav Nešetřil

Download or read book The Seventh European Conference on Combinatorics, Graph Theory and Applications written by Jaroslav Nešetřil. This book was released on 2014-01-18. Available in PDF, EPUB and Kindle. Book excerpt: In the tradition of EuroComb'01 (Barcelona), Eurocomb'03 (Prague), EuroComb'05 (Berlin), Eurocomb'07 (Seville), Eurocomb'09 (Bordeaux), and Eurocomb'11 (Budapest), this volume covers recent advances in combinatorics and graph theory including applications in other areas of mathematics, computer science and engineering. Topics include, but are not limited to: Algebraic combinatorics, combinatorial geometry, combinatorial number theory, combinatorial optimization, designs and configurations, enumerative combinatorics, extremal combinatorics, ordered sets, random methods, topological combinatorics.

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