利用锥上的不动点定理,考察了一类非线性特征值问题u″(t)+λf(t,u(t))=0,0≤t≤1, u(0)=0,au(η)=u(1)的多个正解的存在性,给出了四个正解存在的充分条件,这里0〈η〈1,a〉0.
We study existence of four positive solutions of nonlinear eigenvalue problems u″(t)+λf(t,u(t))=0,0≤t≤1, u(0)=0,au(η)=u(1)The existence theorem is obtained by using fixed point theorem in cones. Here 0〈η〈1,a〉0.