Airy Phenomena and Analytic Combinatorics of Connected Graphs
Identifieur interne : 009122 ( Main/Merge ); précédent : 009121; suivant : 009123Airy Phenomena and Analytic Combinatorics of Connected Graphs
Auteurs : Philippe Flajolet [France] ; Bruno Salvy [France] ; Gilles Schaeffer [France]Source :
Descripteurs français
Abstract
The enumeration of connected graphs has been so far dealt with by probabilistic methods, by special combinatorial decompositions or by somewhat indirect formal series manipulations. We show here that it is possible to make analytic sense of the divergent series that expresses the generating function of connected graphs. As a consequence, it becomes possible to derive analytically known enumeration results using only first principles of combinatorial analysis and straight asymptotic analysis---specifically, the saddle-point method. The enumeration of connected graphs by excess derives from a simple saddle-point analysis; furthermore, a refined analysis based on coalescent saddle points yields an explicit connection with Airy functions.
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<front><div type="abstract" xml:lang="en">The enumeration of connected graphs has been so far dealt with by probabilistic methods, by special combinatorial decompositions or by somewhat indirect formal series manipulations. We show here that it is possible to make analytic sense of the divergent series that expresses the generating function of connected graphs. As a consequence, it becomes possible to derive analytically known enumeration results using only first principles of combinatorial analysis and straight asymptotic analysis---specifically, the saddle-point method. The enumeration of connected graphs by excess derives from a simple saddle-point analysis; furthermore, a refined analysis based on coalescent saddle points yields an explicit connection with Airy functions.</div>
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