Semilinear elliptic equation;
Variational methods;
Local degree;
A priori estimates;
LINEAR DIRICHLET PROBLEM;
OPERATOR-EQUATIONS;
D O I:
10.1016/j.jmaa.2019.03.028
中图分类号:
O29 [应用数学];
学科分类号:
070104 ;
摘要:
In this paper we establish sufficient conditions for an asymptotically linear elliptic boundary value problem to have at least five solutions when the range of the derivative of the nonlinearity includes at least the first two eigenvalues. We make extensive use of variational methods and characterizations of the local degree of critical points. Furthermore, uniqueness and qualitative properties of the solutions are investigated. (C) 2019 Elsevier Inc. All rights reserved.