By Pemantle R., Wilson M.C.

ISBN-10: 1107031575

ISBN-13: 9781107031579

This booklet is the 1st to regard the analytic elements of combinatorial enumeration from a multivariate standpoint. Analytic combinatorics is a department of enumeration that makes use of analytic strategies to estimate combinatorial amounts: producing features are outlined and their coefficients are then envisioned through complicated contour integrals. The multivariate case includes suggestions renowned in different components of arithmetic yet now not in combinatorics. geared toward graduate scholars and researchers in enumerative combinatorics, the booklet comprises all of the valuable historical past, together with a evaluate of the makes use of of producing features in combinatorial enumeration in addition to chapters dedicated to saddle aspect research, Groebner bases, Laurent sequence and amoebas, and a smattering of differential and algebraic topology. All software program besides different ancillary fabric should be situated through the booklet site, http://www.cs.auckland.ac.nz/~mcw/Research/mvGF/asymultseq/ACSVbook

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Extra resources for Analytic Combinatorics in Several Variables

Example text

One subject in probability theory, namely the study of branching processes, is almost always dealt with by means of generating functions. , f (z) = ∞ n=0 pn z with pn ≥ 0 and n=0 pn = 1. A branching process with offspring distribution f is a random family tree with one progenitor in generation 0 and each individual in each generation having a random number of children; these numbers of children born to the individuals in a generation are independent, and each is equal to n with probability pn .

2 Rational Operations on Generating Functions A d-variate combinatorial class is a set A, which is the disjoint union of finite sets {A r : r ∈ Nd } in some natural way. , |A r | = a r for all r. We also say that F “counts A by φ,” where φ is the map taking x ∈ A to the r for which x ∈ A r . Arithmetical operations in the ring of formal power series were defined to correspond to existing operations on analytic power series. It is instructive to find interpretations for these operations on the combinatorial level.

Words in the alphabet [d] with no consecutive repetition of any symbol allowed. Of course |An | = d · (d − 1)n−1 , but suppose we wish to count differently. Let F count Smirnov words by number of occurrences of each symbol, and let G count the class B of all words on the alphabet [d], also by number of occurrences of each symbol. Starting with x ∈ A and substituting an arbitrary nonzero string of the symbol j for each occurrence of j in x produces each element of B in zj , a unique way. , 1 − z1 1 − zd .

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Analytic Combinatorics in Several Variables by Pemantle R., Wilson M.C.


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