Results 41 to 50 of about 396,999 (317)
Enumeration of dissociation sets in grid graphs
AIMS MathematicsA dissociation set of a graph $ G $ refers to a set of vertices inducing a subgraph with maximum degree at most 1 and serves as a generalization of two fundamental concepts in graph theory: Independent sets and induced matchings.
Wenke Zhou +3 more
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A simple recurrence formula for the number of rooted maps on surfaces by edges and genus [PDF]
Discrete Mathematics & Theoretical Computer Science, 2014 We establish a simple recurrence formula for the number $Q_g^n$ of rooted orientable maps counted by edges and genus. The formula is a consequence of the KP equation for the generating function of bipartite maps, coupled with a Tutte equation, and it was
Sean Carrell, Guillaume Chapuy
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Enumeration of irredundant forests
Theoretical Computer Science, 2022 Reverse search is a convenient method for enumerating structured objects, that can be used both to address theoretical issues and to solve data mining problems. This method has already been successfully developed to handle unordered trees. If the literature proposes solutions to enumerate singletons of trees, we study in this article a more general ...
Ingels, Florian, Azaïs, Romain
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The unpredictably eruptive dynamics of spruce budworm populations in eastern Canada
Population Ecology, EarlyView.We examine historical population data for spruce budworm from several locations through the period 1930–1997, and use density‐dependent recruitment curves to test whether the pattern of population growth over time is more consistent with Royama's (1984; Ecological Monographs 54:429–462) linear R(t) model of harmonic oscillation at Green River New ...
Barry J. Cooke, Jacques Régnière
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Advanced results in enumeration of hyperfields
AIMS Mathematics, 2020 The purpose of this paper is to introducing a computational method to construction and classification of finite hyperfields (in the sense of Krasner). In this regards first we introduce a mathematical method to produce hyperfields from a family of a non ...
R. Ameri, M. Eyvazi, S. Hoskova-Mayerova
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A simple formula for bipartite and quasi-bipartite maps with boundaries [PDF]
Discrete Mathematics & Theoretical Computer Science, 2012 We obtain a very simple formula for the generating function of bipartite (resp. quasi-bipartite) planar maps with boundaries (holes) of prescribed lengths, which generalizes certain expressions obtained by Eynard in a book to appear.
Gwendal Collet, Eric Fusy
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Foods, 2022 Probiotics are universally recognized for their health benefits, despite the fact that their effects depend on the strain. Identification and enumeration of probiotic strains are required prior to evaluating their effectiveness.
Lei Zhao +9 more
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On the enumeration of polyhedra
Discrete Mathematics, 1982 AbstractAn algorithm for the enumeration of all combinatorial types of three-dimensional polyhedra is described and the respective numbers of polyhedra with f faces, 4⩽f⩽11, are listed.
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Network topology drives population temporal variability in experimental habitat networks
Population Ecology, EarlyView.Habitat patches connected by dispersal pathways form habitat networks. We explored how network topology affects population outcomes in laboratory experiments using a model species (Daphnia carinata). Central habitat nodes in complex lattice networks exhibited lower temporal variability in population sizes, suggesting they support more stable ...
Yiwen Xu +3 more
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Russian Journal of Agricultural and Socio-Economic Sciences, 2021 A survey was conducted in Kano State-Nigeria aimed at exploring the travails of the dry-land farmers of the state amidst Covid-19 pandemic lockdown. The exercise was carried out in 8 Local Government Areas marked out in two sampling units within the ...
Salami A.O.
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