This work was supported by the Special Funds of State Major Basic Research Projects(Grant No.G1999032804);the National Natural Science Foundation of China(Grant No.19871027);Mathematical Tianyuan Youth Foundation of the National Natural Science Foundation of China(No.10226016).
Based on the eigensystem {λj,φjof -Δ, the multiple solutions for nonlinear problem Δu+f(u)=0 in Ω,u=0 onαΩ are approximated. A new search-extension method (SEM), which consists of three steps in three level sub...