Results 61 to 70 of about 476,988 (354)
On infinite permutations [PDF]
Discrete Mathematics & Theoretical Computer Science, 2005 We define an infinite permutation as a sequence of reals taken up to the order, or, equivalently, as a linear ordering of a finite or countable set. Then we introduce and characterize periodic permutations; surprisingly, for each period $t$ there is an infinite number of distinct $t$-periodic permutations.
Anna E. Frid, Dmitri G. Fon-Der-Flaass
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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
wiley +1 more source
Paweł Hendrich’s Emergent Sound System
Musicology Today, 2015 Paweł Hendrich’s compositions can be compared to macrocrystals - solids composed of numerous small and identical elements, constructed in accordance with a strict pattern.
Hendrich Paweł, Stefański Krzysztof
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On k-crossings and k-nestings of permutations [PDF]
, 2009 We introduce k-crossings and k-nestings of permutations. We show that the crossing number and the nesting number of permutations have a symmetric joint distribution.
Burrill, Sophie +2 more
core +1 more source
, 2022 Let $C(n)$ denote the number of permutations $σ$ of $[n]=\{1,2,\dots,n\}$ such that $\gcd(j,σ(j))=1$ for each $j\in[n]$. We prove that for $n$ sufficiently large, $n!/3.73^n < C(n) < n!/2.5^n$.
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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
wiley +1 more source
A complete enumeration of Ballot permutations avoiding sets of small patterns [PDF]
Enumerative Combinatorics and Applications, 2022 Nathan Sun
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On a mnemonic construction of permutations
Journal of Mathematical Cryptology, 2017 In the past when only “paper and pencil” ciphers were in use, a mnemonic Bellaso’s method was applied to obtain a permutation from a meaningful phrase. It turns out that even nowadays this method and its variations are employed and provide a simple but ...
Antal Eugen, Grošek Otokar, Horak Peter
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Journal of Combinatorial Theory, Series A, 2004 Chung and Graham define quasirandom subsets of $\mathbb{Z}_n$ to be those with any one of a large collection of equivalent random-like properties. We weaken their definition and call a subset of $\mathbb{Z}_n$ $ $-balanced if its discrepancy on each interval is bounded by $ n$.
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occumb: An R package for site occupancy modeling of eDNA metabarcoding data
Population Ecology, EarlyView.This study introduces a new R package, occumb, for the convenient application of site occupancy modeling using environmental DNA (eDNA) metabarcoding data. We outline a data analysis workflow, including data setup, model fitting, model assessment, and comparison of potential study settings based on model predictions, all of which can be performed using
Keiichi Fukaya, Yuta Hasebe
wiley +1 more source