Results 21 to 30 of about 2,802 (159)

On the demand for telemedicine: Evidence from the COVID‐19 pandemic

Health Economics, Volume 31, Issue 7, Page 1491-1505, July 2022., 2022
Abstract Telemedicine can expand access to health care at relatively low cost. Historically, however, demand for telemedicine has remained low. Using administrative records and a difference‐in‐differences methodology, we estimate the change in demand for telemedicine experienced after the onset of the COVID‐19 epidemic and the imposition of mobility ...
Matias Busso, Maria P. Gonzalez, Carlos Scartascini   +2 more
wiley   +1 more source

A Class of Variable-Order Fractional p·-Kirchhoff-Type Systems

Journal of Function Spaces, 2021
This paper is concerned with an elliptic system of Kirchhoff type, driven by the variable-order fractional px-operator. With the help of the direct variational method and Ekeland variational principle, we show the existence of a weak solution.
Yong Wu, Zhenhua Qiao, Mohamed Karim Hamdani, Bingyu Kou, Libo Yang   +4 more
doaj   +1 more source

A class of fourth-order elliptic equations with concave and convex nonlinearities in $\mathbb{R}^N$

Electronic Journal of Qualitative Theory of Differential Equations, 2021
In this article, we study the multiplicity of solutions for a class of fourth-order elliptic equations with concave and convex nonlinearities in $\mathbb{R}^N$.
Zijian Wu, Haibo Chen
doaj   +1 more source

Multiple Positive Solutions and Estimates of Extremal Values for a Nonlocal Problem with Critical Sobolev Exponent and Concave‐Convex Nonlinearities

Journal of Function Spaces, Volume 2022, Issue 1, 2022., 2022
We are concerned with the following nonlocal problem involving critical Sobolev exponent −a−b∫Ω∇u2dxΔu=λuq−2u+δu2u,x∈Ω,u=0,x∈∂Ω, where Ω is a smooth bounded domain in ℝ4, a, b > 0, 1 < q < 2, δ, and λ are positive parameters. We prove the existence of two positive solutions and obtain uniform estimates of extremal values for the problem.
Zhigao Shi, Xiaotao Qian, Simone Secchi
wiley   +1 more source

On Ekeland’s variational principle [PDF]

Journal of Fixed Point Theory and Applications, 2011
For proper lower semi-continuous functionals bounded below which do not increase upon polarization, an improved version of Ekeland's variational principle can be formulated in Banach spaces, which provides almost symmetric points.
openaire   +4 more sources

Existence of Two Solutions for a Critical Elliptic Problem with Nonlocal Term in ℝ4

Journal of Function Spaces, Volume 2022, Issue 1, 2022., 2022
In this paper, we prove the existence of two positive solutions for a critical elliptic problem with nonlocal term and Sobolev exponent in dimension four.
Khadidja Sabri, Atika Matallah, Safia Benmansour, Mohammed El Mokhtar Ould El Mokhtar, Pasquale Vetro   +4 more
wiley   +1 more source

On p‐Laplace Equations with Singular Nonlinearities and Critical Sobolev Exponent

Journal of Function Spaces, Volume 2022, Issue 1, 2022., 2022
In this paper, we deal with p‐Laplace equations with singular nonlinearities and critical Sobolev exponent. By using the Nehari manifold, Mountain Pass theorem, and Maximum principle theorem, we prove the existence of at least four distinct nontrivial solutions.
Mohammed El Mokhtar ould El Mokhtar, Andrea Scapellato   +1 more
wiley   +1 more source

An induction theorem and nonlinear regularity models [PDF]

, 2015
A general nonlinear regularity model for a set-valued mapping $F:X\times R_+\rightrightarrows Y$, where $X$ and $Y$ are metric spaces, is considered using special iteration procedures, going back to Banach, Schauder, Lusternik and Graves.
Khanh, Phan Q., Kruger, Alexander Y., Thao, Nguyen H.   +2 more
core   +3 more sources

Multiplicity Results for Weak Solutions of a Semilinear Dirichlet Elliptic Problem with a Parametric Nonlinearity

International Journal of Mathematics and Mathematical Sciences, Volume 2022, Issue 1, 2022., 2022
This paper deals with the existence of weak solutions to a Dirichlet problem for a semilinear elliptic equation involving the difference of two main nonlinearities functions that depends on a real parameter λ. According to the values of λ, we give both nonexistence and multiplicity results by using variational methods. In particular, we first exhibit a
Ayékotan Messan Joseph Tchalla, Kokou Tcharie, Nawab Hussain   +2 more
wiley   +1 more source

On an elliptic system of p(x)-Kirchhoff-type under neumann boundary condition

Mathematical Modelling and Analysis, 2012
In the present paper, by using the direct variational method and the Ekeland variational principle, we study the existence of solutions for an elliptic system of p(x)-Kirchhoff-type under Neumann boundary condition and show the existence of a weak ...
Zehra Yucedag, Mustafa Avci, Rabil Mashiyev   +2 more
doaj   +1 more source