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Tree-like properties of cycle factorizations
[article]
2001
arXiv
pre-print
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We prove a refinement of a theorem of Dénes that establishes new tree-like properties of factorizations. ...
We provide a bijection between the set of factorizations, that is, ordered (n-1)-tuples of transpositions in S_n whose product is (12...n), and labelled trees on n vertices. ...
Acknowledgements This work was supported by the Natural Sciences and Engineering Research Council of Canada, through a grant to IG, and a PGSA to AY. This work was partially completed ...
arXiv:math/0106039v1
fatcat:m27hemjkqze5thuzwoad5boev4
Tree-like Properties of Cycle Factorizations
2002
Journal of combinatorial theory. Series A
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We prove a refinement of a theorem of J. Dénes (1959, Publ. Math. Inst. Hungar. Acad. Sci. 4, 63-71) that establishes new tree-like properties of factorizations. ...
In particular, we show that a certain class of transpositions of a factorization corresponds naturally under our bijection to leaf edges (incident with a vertex of degree 1) of a tree. ...
ACKNOWLEDGMENTS This work was supported by the Natural Sciences and Engineering Research Council of Canada, through a grant to I.G., and a PGSA to A.Y. ...
doi:10.1006/jcta.2001.3230
fatcat:nlnourxzpndi3b3lvl3o7wzfwq
Sustainable management of uneven-aged private forests: a case study from Ontario, Canada
1999
Ecological Economics
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These three economic factors are: (1) choice of the rate of time preference; (2) income and property taxes; and (3) subsidy for rehabilitation of degraded forests. ...
As a result of the discrete nature of tree distribution and prices of different size trees, increased income tax rates may not result in higher tax revenue. ...
I would also like to thank Dr J. C. Nautiyal, and three reviewers for their helpful comments. ...
doi:10.1016/s0921-8009(98)00106-2
fatcat:pdje6lmxrnf33byva5al35fkfm
Disease Prediction Based on Symptoms By Using Decision Tree And Random Forest In Machine Learning
2022
International Journal of Scientific Research in Computer Science Engineering and Information Technology
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AI calculations, for example, Support Vector Machine, Decision Tree and Random Forest are utilized on the gave dataset and anticipate the sickness. ...
Dealing with the colossal measure of information of the patients is troublesome. Taking care of this information through Big Data Analytics is simpler. ...
It's structural choice tree is the hierarchical like IF -Then manages tree. ...
doi:10.32628/cseit2283105
fatcat:kxcii2nd6fd43f4cgix3oug4la
Soils and Chemical Cycling of Elements After Land Use Changes (Case Studies)
2008
Miscellanea Geographica: Regional Studies on Development
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The process of abandonment of arable land seems to be one of the main factors of changes in landscape and soil properties. This problem occurs on nearly 10% of arable land in Poland. ...
In the beginning, the appearance of trees on the former arable land changes soil properties because soil (and plant) is the most dependent component of the natural environment. ...
The goal of the study was to determine the trend and the quantity range of its transformation in properties of soil and chemical cycling of elements after land use changes. ...
doi:10.2478/mgrsd-2008-0014
fatcat:rojmgribxrhr7j475d5przroiy
Response of northeastern North American forests to climate change: Will soil conditions constrain tree species migration?
2010
Environmental Reviews
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Considering the broad tolerance of most tree species to variations in soil factors, soils should not represent a major constraint for the northward shift of tree species. ...
Because tree species respond individualistically to climate variables and soil properties, new tree communities are likely to emerge from climate change. ...
We thank Martin Lavoie, Frank Berninger and two anonymous reviewers for valuable comments on earlier versions of the manuscript, and Pamela Cheers for editing the text. ...
doi:10.1139/a10-013
fatcat:sgixd637pffztdzbsmmf7xbn2y
Fast construction of assembly trees for molecular graphs
2011
Journal of Computational Chemistry
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cycles, but dependent on the branching factor of the molecular graph. ...
The first step contracts all cycles in the input graph. The second step builds an assembly tree from the reduced graph. ...
The second one is also linear in the number of edges in the contracted graph, but also depends on the branching factor of this graph. We also studied the balance properties of the obtained tree. ...
doi:10.1002/jcc.21738
pmid:21328401
fatcat:kquqq5aeibe67gnset5yk2eao4
Identifying Species Network Features from Gene Tree Quartets Under the Coalescent Model
2018
Bulletin of Mathematical Biology
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We show additionally how to compute quartet concordance factors for a network in terms of simpler networks, and explore some circumstances in which cycles of size 3 and hybrid nodes in 4cycles can be detected ...
In particular, every cycle of size at least 4 and every hybrid node in a cycle of size at least 5 is identifiable. ...
Allman for their technical assistance and suggestions during the development of this work. ...
doi:10.1007/s11538-018-0485-4
pmid:30094772
fatcat:quzb7elclvguxnflunhwgfo6vq
Identifying species network features from gene tree quartets under the coalescent model
[article]
2017
arXiv
pre-print
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We show additionally how to compute quartet concordance factors for a network in terms of simpler networks, and explore some circumstances in which cycles of size 3 and hybrid nodes in 4-cycles can be ...
In particular, every cycle of size at least 4 and every hybrid node in a cycle of size at least 5 is identifiable. ...
Allman for their technical assistance and suggestions during the development of this work. ...
arXiv:1711.10545v1
fatcat:fzhhovaoandipet2cffbpsd4wa
Leucaena leucocephala and adjacent native limestone forest habitats contrast in soil properties on Tinian Island
2016
Communicative & Integrative Biology
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Soil chemical properties were determined for the 2 tree cover types to inform management decisions. ...
The results indicated that L. leucocephala cover generated substantial changes in soil chemical properties when compared with native forest tree cover, illuminating one means by which understory vegetation ...
Various components of the nitrogen cycle were among the soil properties that were most affected by tree cover type. ...
doi:10.1080/19420889.2016.1212792
pmid:27829978
pmcid:PMC5100652
fatcat:vzeg6d253rca7pzbywwrbpuoru
Simplicial decompositions of graphs: a survey of applications
1989
Discrete Mathematics
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vertex to some cycle and joining it to exactly two vertices of that cycle; an S, is defined like an S,, except that the new vertex is joined to exactly three vertices of the cycle (thus, an S, is a TK, ...
These are precisely the graphs having tree-width at most k -the tree-width of G is the smallest k such that G admits a tree-decomposition into factors of order at most k + 1which is a minor-closed property ...
doi:10.1016/0012-365x(89)90084-8
fatcat:n7g4dykpxnahzogrtopyf2nitq
Indications of enhanced soil ecosystem functions in polyculture reforested grassland
2019
Annals of Tropical Research
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Larger mean soil 15N values and a more negative 15N enrichment factor (ε = -5.82‰) for the whole 50cm soil depth in tree plantation indicated a better N cycling compared to grassland vegetation. ...
soil, its rate of incorporation, and the degree of soil N cycling. ...
The warp and woof of tree-soil interactions. 42: 89-106 Black CA. 1965. Methods of soil analysis: Part I Physical and mineralogical properties. ...
doi:10.32945/atr4114.2019
fatcat:higrtwed25herd3pp5eoojbhz4
PROFESSIONAL CONSULTATION TO HELP AVOID LEGAL PROBLEMS
1985
Arboricultural Journal, The International Journal of Urban Forestry
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Frequency depends on factors such as species, growth rate, tree age, and location. ...
The objectives of this study are to determine the effect of pruning cycle on the condition class of street trees, and to determine an optimum pruning cycle for a case study. ...
doi:10.1080/03071375.1985.9746716
fatcat:e4szwecuezew5eouokiqjlh2ae
NANUQ: a method for inferring species networks from gene trees under the coalescent model
2019
Algorithms for Molecular Biology
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Species networks generalize the notion of species trees to allow for hybridization or other lateral gene transfer. ...
We propose a new algorithm for statistical inference of a level-1 species network under this model, from data consisting of gene tree topologies, and provide the theoretical justification for it. ...
Acknowledgements This research was supported, in part, by the National Institutes of Health Grant R01 GM117590, awarded under the Joint DMS/NIGMS Initiative to Support Research at the Interface of the ...
doi:10.1186/s13015-019-0159-2
pmid:31827592
pmcid:PMC6896299
fatcat:q7u7b4e2xzgwdlvblzy6sdmd3y
NANUQ: A method for inferring species networks from gene trees under the coalescent model
[article]
2019
arXiv
pre-print
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
Species networks generalize the notion of species trees to allow for hybridization or other lateral gene transfer. ...
We propose a new algorithm for statistical inference of a level-1 species network under this model, from data consisting of gene tree topologies, and provide the theoretical justification for it. ...
Acknowledgements This research was supported, in part, by the National Institutes of Health Grant R01 GM117590, awarded under the Joint DMS/NIGMS Initiative to Support Research at the Interface of the ...
arXiv:1905.07050v1
fatcat:hsok6oln6fbkvgvn75gzsiy7ji
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