Green's function;
high order system boundary value problems;
positive solutions;
Sturm-Liouville problem;
2ND-ORDER DIFFERENTIAL-EQUATIONS;
MULTIPLE POSITIVE SOLUTIONS;
EXISTENCE;
UNIQUENESS;
D O I:
10.4153/CMB-2011-138-3
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
We study an even order system boundary value problem with periodic boundary conditions. By establishing the existence of a positive eigenvalue of an associated linear system Sturm-Liouville problem, we obtain new conditions for the boundary value problem to have a positive solution. Our major tools are the Krein-Rutman theorem for linear spectra and the fixed point index theory for compact operators.