摘要:
本文研究了一类非线性二阶常微分方程Dirichlet边值问题{u''-a(t)u+f(t,u)=0,0<t<1,u(0)=u(1)=0正解的存在性,其中f:[0,1]×[0,∞)→[0,∞)连续,a(t):[0,1]→[0,∞)连续,主要结果的证明基于锥拉伸与压缩不动点定理.%In this paper,we study the existence of positive solutions for a class of nonlinear second-order Dirichlet problem {u"-a(t)u + f(t,u) =0,0 <t < 1,u(0) =u(1) =0,where f:[0,1]× [0,∞) → [0,∞) is continuous,a(t):[0,1]→ [0,∞) is continuous.The proof of the main results is based on the fixed-point theorem of cone expansion-compression.