Existence of positive solutions for indefinite
semilinear elliptic equations with concave and convex
nonlinaerities
Tsung-fang Wu
Department of Applied Mathematics
National University of Kaohsiung, Kaohsiung 811, Taiwan
Abstract. In this talk, we will study the decomposition of the Nehari manifold by
exploiting the combination of concave and convex nonlinearities. The result is subsequently used, in conjunction with the Ljusternik-Schnirelmann category and the variational methods, to prove the existence and multiplicity of positive solutions for an indefinite elliptic problem involving critical Sobolev exponent.