M. Badiale et Na. Tchou, SEMILINEAR ELLIPTIC PROBLEMS WITH SINGULAR POTENTIALS IN R(N), Proceedings of the Royal Society of Edinburgh. Section A. Mathematics, 123, 1993, pp. 593-619
We study a semilinear elliptic problem on R(N) where a potential is no
t a bounded function but can also be an infinite measure. We analyse t
he lack of compactness of the problem, obtaining a structure theorem f
or Palais-Smale sequences. This result allows us to obtain different k
inds of existence theorems by a variational approach.