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2015 | Buch

Counting with Symmetric Functions

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This monograph provides a self-contained introduction to symmetric functions and their use in enumerative combinatorics. It is the first book to explore many of the methods and results that the authors present. Numerous exercises are included throughout, along with full solutions, to illustrate concepts and also highlight many interesting mathematical ideas.

The text begins by introducing fundamental combinatorial objects such as permutations and integer partitions, as well as generating functions. Symmetric functions are considered in the next chapter, with a unique emphasis on the combinatorics of the transition matrices between bases of symmetric functions. Chapter 3 uses this introductory material to describe how to find an assortment of generating functions for permutation statistics, and then these techniques are extended to find generating functions for a variety of objects in Chapter 4. The next two chapters present the Robinson-Schensted-Knuth algorithm and a method for proving Pólya’s enumeration theorem using symmetric functions. Chapters 7 and 8 are more specialized than the preceding ones, covering consecutive pattern matches in permutations, words, cycles, and alternating permutations and introducing the reciprocity method as a way to define ring homomorphisms with desirable properties.

Counting with Symmetric Functions will appeal to graduate students and researchers in mathematics or related subjects who are interested in counting methods, generating functions, or symmetric functions. The unique approach taken and results and exercises explored by the authors make it an important contribution to the mathematical literature.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Permutations, Partitions, and Power Series
Abstract
Statistics on permutations and rearrangements are defined and relationships between q-analogues of n, \(n!\), and \(\binom{n}{k}\) are proved. Integer partitions are defined and a few results concerning them are discussed. Generating functions are introduced as both elements of the ring of formal power series and complex valued functions.
Anthony Mendes, Jeffrey Remmel
Chapter 2. Symmetric Functions
Abstract
The ring of symmetric functions is introduced. The six standard bases for symmetric functions; namely, the monomial, elementary, homogeneous, power, forgotten, and Schur symmetric functions, are defined. Numerous relationships between these functions are proved.
Anthony Mendes, Jeffrey Remmel
Chapter 3. Counting with the Elementary and Homogeneous Symmetric Functions
Abstract
The relationship between the elementary and homogeneous symmetric functions, specifically the expansion involving brick tabloids, is used to find an assortment of generating functions. We are able to count and refine permutations according to restricted appearances of descents and prove a variety of results about words.
Anthony Mendes, Jeffrey Remmel
Chapter 4. Counting with Nonstandard Bases
Abstract
Generalizing the relationship between the elementary and power symmetric functions, we define a new basis for the ring of symmetric functions which has an expansion in terms of specially weighted brick tabloids. This allows us even more versatility when using symmetric functions in enumerating permutations and words. We show how this new basis can be used to find generating functions for various refinements of permutations and words, recurrence relations, and objects counted by the exponential formula.
Anthony Mendes, Jeffrey Remmel
Chapter 5. Counting with RSK
Abstract
The RSK algorithm is introduced and used to find generating functions for permutation statistics. Connections are made to increasing subsequences in permutations and words and the Schur symmetric functions. A q-analogue of the hook length formula is proved, and the Hillman-Grassl algorithm is introduced.
Anthony Mendes, Jeffrey Remmel
Chapter 6. Counting Problems That Involve Symmetry
Abstract
Symmetric functions are used to prove Pólya’s enumeration theorem, allowing us to count objects modulo symmetries.
Anthony Mendes, Jeffrey Remmel
Chapter 7. Consecutive Patterns
Abstract
This chapter applies the machinery of ring homomorphisms on symmetric functions to understand consecutive pattern matches in permutations, words, cycles, and in alternating permutations.
Anthony Mendes, Jeffrey Remmel
Chapter 8. The Reciprocity Method
Abstract
In previous chapters, we defined ring homomorphisms \(\varphi\) on the ring of symmetric functions in order to find generating functions for permutation statistics. Doing this requires an a priori insightful definition of what the function \(\varphi\) should be. This chapter introduces the reciprocity method, which provides a way to come up with such a function \(\varphi\).
Anthony Mendes, Jeffrey Remmel
Backmatter
Metadaten
Titel
Counting with Symmetric Functions
verfasst von
Anthony Mendes
Jeffrey Remmel
Copyright-Jahr
2015
Electronic ISBN
978-3-319-23618-6
Print ISBN
978-3-319-23617-9
DOI
https://doi.org/10.1007/978-3-319-23618-6