Zobrazeno 1 - 10
of 233
pro vyhledávání: '"AMSTER, PABLO"'
We study an almost periodic version of a metapopulation model developed by Tilman \textit{et.al} and Nee \textit{et.al} in the nineties, which generalizes the classical Levins approach by considering several species in competition affected by habitat
Externí odkaz:
http://arxiv.org/abs/2412.02952
Autor:
Amster, Pablo, Epstein, Julián
An abstract version of the celebrated inequality is described by means of the spectral bound of an operator defined on a Banach lattice. As a consequence, uniqueness and continuous dependence results for the general semilinear problem $Lu=N(u)$ are e
Externí odkaz:
http://arxiv.org/abs/2308.03604
In this paper, we prove the existence of two positive $T$-periodic solutions of an electrostatic actuator modeled by the time-delayed Duffing equation $$\ddot{x}(t)+f_{D}(x(t),\dot{x}(t))+ x(t)=1- \dfrac{e \mathcal{V}^{2}(t,x(t),x_{d}(t),\dot{x}(t),\
Externí odkaz:
http://arxiv.org/abs/2305.00103
Autor:
Amster, Pablo
In a paper from 1960, Felix Browder established a theorem concerning the continuation of the fixed points of a family of continuous functions $f_t:X\to X$ depending continuously on a parameter $t\in [0,1]$, where $X$ is a convex and compact subset of
Externí odkaz:
http://arxiv.org/abs/2112.12803
Autor:
Amster, Pablo, Bondorevsky, Melanie
An N-dimensional generalization of Nicholson's equation is analyzed. We consider a model including multiple delays, nonlinear coefficients and a nonlinear harvesting term. Inspired by previous results in this subject, we obtain sufficient conditions
Externí odkaz:
http://arxiv.org/abs/2112.05713
Publikováno v:
In Communications in Nonlinear Science and Numerical Simulation May 2024 132
Autor:
Amster, Pablo, Epstein, Julián
An abstract formulation of a duality principle established by Krasnoselskii is presented. Under appropriate conditions, it shall be shown that, if the solutions of a nonlinear functional equation can be obtained by finding fixed points of certain ope
Externí odkaz:
http://arxiv.org/abs/2107.03842
Publikováno v:
In Communications in Nonlinear Science and Numerical Simulation April 2024 131
Autor:
Amster, Pablo
We give an elementary proof of a Landesman-Lazer type result for systems by means of a shooting argument and explore its connection with the fundamental theorem of algebra.
Externí odkaz:
http://arxiv.org/abs/2010.06308
We study some properties of the range of the relativistic pendulum operator $\mathcal P$, that is, the set of possible continuous $T$-periodic forcing terms $p$ for which the equation $\mathcal P x=p$ admits a $T$-periodic solution over a $T$-periodi
Externí odkaz:
http://arxiv.org/abs/2005.12851