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Search: All articles in the CMB digital archive with keyword model

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1. CMB Online first

Aujogue, Jean-Baptiste
 A short proof of the characterization of model sets by almost automorphy The aim of this note is to provide a conceptually simple demonstration of the fact that repetitive model sets are characterized as the repetitive Meyer sets with an almost automorphic associated dynamical system. Keywords:Meyer set, model set, almost automorphyCategories:37B50, 37B05

2. CMB Online first

Zhang, Guo-Bao; Tian, Ge
 Stability of Traveling Wavefronts for a Two-Component Lattice Dynamical System Arising in Competition Models In this paper, we study a two-component Lotka-Volterra competition system on an one-dimensional spatial lattice. By the method of the comparison principle together with the weighted energy, we prove that the traveling wavefronts with large speed are exponentially asymptotically stable, when the initial perturbation around the traveling wavefronts decays exponentially as $j+ct \rightarrow -\infty$, where $j\in\mathbb{Z}$, $t\gt 0$, but the initial perturbation can be arbitrarily large on other locations. This partially answers an open problem by J.-S. Guo and C.-H. Wu. Keywords:lattice dynamical system, competition model, traveling wavefront, stabilityCategories:34A33, 34K20, 92D25

3. CMB 2017 (vol 60 pp. 436)

Weng, Peixuan; Liu, Li
 Globally Asymptotic Stability of a Delayed Integro-Differential Equation with Nonlocal Diffusion We study a population model with nonlocal diffusion, which is a delayed integro-differential equation with double nonlinearity and two integrable kernels. By comparison method and analytical technique, we obtain globally asymptotic stability of the zero solution and the positive equilibrium. The results obtained reveal that the globally asymptotic stability only depends on the property of nonlinearity. As application, an example for a population model with age structure is discussed at the end of the article. Keywords:integro-differential equation, nonlocal diffusion, equilibrium, globally asymptotic stability, population model with age structureCategories:45J05, 35K57, 92D25

4. CMB 2013 (vol 57 pp. 225)

 Small Flag Complexes with Torsion We classify flag complexes on at most $12$ vertices with torsion in the first homology group. The result is moderately computer-aided. As a consequence we confirm a folklore conjecture that the smallest poset whose order complex is homotopy equivalent to the real projective plane (and also the smallest poset with torsion in the first homology group) has exactly $13$ elements. Keywords:clique complex, order complex, homology, torsion, minimal modelCategories:55U10, 06A11, 55P40, 55-04, 05-04

5. CMB 2011 (vol 55 pp. 632)

Pigola, S.; Rimoldi, M.
 Characterizations of Model Manifolds by Means of Certain Differential Systems We prove metric rigidity for complete manifolds supporting solutions of certain second order differential systems, thus extending classical works on a characterization of space-forms. Along the way, we also discover new characterizations of space-forms. We next generalize results concerning metric rigidity via equations involving vector fields. Keywords:metric rigidity, model manifolds, Obata's type theoremsCategory:53C20

6. CMB 2011 (vol 55 pp. 487)

Deng, Xinghua; Moody, Robert V.
 Weighted Model Sets and their Higher Point-Correlations Examples of distinct weighted model sets with equal $2,3,4, 5$-point correlations are given. Keywords:model sets, correlations, diffractionCategories:52C23, 51P05, 74E15, 60G55

7. CMB 2008 (vol 51 pp. 146)

Zhou, Xiaowen
 Stepping-Stone Model with Circular Brownian Migration In this paper we consider the stepping-stone model on a circle with circular Brownian migration. We first point out a connection between Arratia flow on the circle and the marginal distribution of this model. We then give a new representation for the stepping-stone model using Arratia flow and circular coalescing Brownian motion. Such a representation enables us to carry out some explicit computations. In particular, we find the distribution for the first time when there is only one type left across the circle. Keywords:stepping-stone model, circular coalescing Brownian motion, Arratia flow, duality, entrance lawCategories:60G57, 60J65

8. CMB 2001 (vol 44 pp. 459)

Kahl, Thomas
 LS-catÃ©gorie algÃ©brique et attachement de cellules Nous montrons que la A-cat\'egorie d'un espace simplement connexe de type fini est inf\'erieure ou \'egale \a $n$ si et seulement si son mod\ele d'Adams-Hilton est un r\'etracte homotopique d'une alg\ebre diff\'erentielle \a $n$ \'etages. Nous en d\'eduisons que l'invariant $\Acat$ augmente au plus de 1 lors de l'attachement d'une cellule \`a un espace. We show that the A-category of a simply connected space of finite type is less than or equal to $n$ if and only if its Adams-Hilton model is a homotopy retract of an $n$-stage differential algebra. We deduce from this that the invariant $\Acat$ increases by at most 1 when a cell is attached to a space. Keywords:LS-category, strong category, Adams-Hilton models, cell attachmentsCategories:55M30, 18G55
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