Results 31 to 40 of about 669,840 (357)
Wheeler-Dewitt Metric and the Attractivity of Gravity [PDF]
, 1994 We investigate the class of ultralocal metrics on the configuration space of canonical gravity. It is described by a parameter $\alpha$, where $\alpha=0.5$ corresponds to general relativity.
Claus Kiefer +7 more
core +3 more sources
Advances in Differential Equations, 2018 We propose and study a nonautonomous harvesting Lotka–Volterra commensalism model incorporating partial closure for the populations. By using the differential inequality theory we obtain sufficient conditions that ensure the extinction, partial survival,
Yu Liu, Xiangdong Xie, Qifa Lin
semanticscholar +1 more source
, 2018 We analyze the growth models for complex networks including preferential attachment (A.-L. Barabasi and R. Albert, Science 286, 509 (1999)) and fitness model (Caldarelli et al., Phys. Rev. Lett. 89, 258702 (2002)) and demonstrate that, under very general
Golosovsky, Michael
core +1 more source
Existence and global attractivity of periodic solutions to some classes of difference equations
Filomat, 2019 Existence and global attractivity of periodic solutions to some subclasses of the following class of difference equations xn+1 = qnxn + f(n,xn, xn-1,..., xn-k), n ? N0, where k ? N0, (qn)n?N0 is a T-periodic sequence (T ? N), and f : N0 x Rk+1 ? R is a
S. Stević +3 more
semanticscholar +1 more source
L’attrait des petites villes, une chance pour redynamiser leur centralité ?
Belgeo, 2019 Small towns, considered as poles of urban centrality, are facing a decline of their attractiveness. This explains why the concept of attractiveness has become one of the main topics of their local policies.
Jean-Charles Edouard
doaj +1 more source
Unique Positive Almost Periodic Solution for Discrete Nonlinear Delay Survival Red Blood Cells Model
Abstract and Applied Analysis, 2009 We obtain sufficient conditions which guarantee the global attractivity of solutions for nonlinear delay survival red blood cells model. Then, some criteria are established for the existence, uniqueness and global attractivity of positive almost periodic
Xitao Yang, Siping Tang
doaj +1 more source
Mathematical biosciences and engineering : MBE, 2019 In this paper, a class of discrete Hopfield-type neural networks with time delays is consid-ered. Sufficient and necessary conditions for global attractivity and stability of the equilibrium of the discrete Hopfield-type neural networks are given by ...
Y. Hong, Wan Biao Ma
semanticscholar +1 more source
, 2015 We consider a piecewise smooth system in the neighborhood of a co-dimension 2 discontinuity manifold $\Sigma$. Within the class of Filippov solutions, if $\Sigma$ is attractive, one should expect solution trajectories to slide on $\Sigma$.
A. Dontchev +25 more
core +1 more source
Sustainability, 2019 Measuring destination attractivity and finding the determinants of attractivity at the county scale can finely reveal migration flows and explain what kinds of counties have higher attractivity.
Qingsheng Yang +2 more
semanticscholar +1 more source
Global attractivity for Volterra type Hadamard fractional integral equations in Fréchet spaces
Demonstratio Mathematica, 2018 In this paper, we present some results concerning the existence and the attractivity of solutions for some functional integral equations of Hadamard fractional order. We use an extension of the Burton-Kirk fixed point theorem in Fréchet spaces.
Abbas Saïd +3 more
doaj +1 more source