EXISTENCE OF POSITIVE SOLUTION OF NONRESONANT SINGULAR NONRESONANT SECOND ORDER BOUNDARY VALUE PROBLEM
二阶非共振半正边值问题正解的存在性

The existence of positive solutions for the second order boundary value problem is considered by transforming the boundary value problem into the integral equation system and using fixed point theory in cones. Here the nonlinearity $f(t,u)$ is not assumed to be nonnegative.