Results 41 to 50 of about 15,510,191 (369)
Positive solutions of positive linear systems
Linear Algebra and its Applications, 1985 AbstractEasily verifiable sufficient conditions are obtained for the existence of a positive solution (componentwise) of a linear nonhomogeneous system of equations with positive coefficients.
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On existence of positive periodic solutions [PDF]
Monatshefte f�r Mathematik, 1998 We present the geometric method for detecting periodic solutions of time periodic nonautonomous differential equations in interior of convex subset of euclidean space. The method is based on the Lefschetz fixed point theorem and the topological principle of Wazewski. Two applications to the existence of positive periodic solutions are considered.
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Boundary Value Problems, 2018 In this paper, we deal with a strong coupled predator–prey model with modified Holling–Tanner functional response under homogeneous Neumann boundary conditions. We mainly discuss the following two problems: (1) stability of the positive constant solution;
Rong Zeng
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Positive Solutions of Periodic Boundary Value Problems for a Class of Second-order Ordinary Differential Equations [PDF]
, 2018 In this paper, we consider the existence of positive solutions to the second-order periodic boundary value problems ...
Kang, H. (Hongliang)
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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
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On a class of one-dimensional superlinear semipositone (p,q) -Laplacian problem
AIMS Mathematics, 2023 We study the existence of positive solutions for a class of one-dimensional superlinear $ (p, q) $ -Laplacian with Sturm-Liouville boundary conditions. We allow the reaction term to be singular at 0 with infinite semipositone behavior.
Xiao Wang, D. D. Hai
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Existence of Positive Solutions for fourth-order Differential Equations with indeterminate weights [PDF]
, 2018 In this paper, the existence of positive solutions of fourth-order differential equations with indeterminate weights is considered as ...
Wang, J. (Jiao)
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Positive solutions to indefinite Neumann problems when the weight has positive average
, 2015 We deal with positive solutions for the Neumann boundary value problem associated with the scalar second order ODE $$ u" + q(t)g(u) = 0, \quad t \in [0, T], $$ where $g: [0, +\infty[\, \to \mathbb{R}$ is positive on $\,]0, +\infty[\,$ and $q(t)$ is an ...
A. Boscaggin +16 more
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, 2017 In this paper, we study the multiplicity and concentration of solutions for the following critical fractional Schrodinger–Poisson system: \begin{eqnarray*} \left\{ \begin{array}{ll} \epsilon^{2s}(-\triangle)^{s} {u}+ V(x)u+\phi u =f(u)+|u|^{2^*_{s}-2}u &\
Zhisu Liu, Jianjun Zhang
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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
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