Multiplicity of non-radial solutions of critical elliptic problems in an annulus

By looking for critical points of functionals defined in some subspaces of H-0(1)(Omega), invariant under some subgroups of O(N), we prove the existence of many positive non-radial solutions for the following semilinear elliptic problem involving critical Sobolev exponent on an annulus, [GRAPHICS] where 2* - 1 := (N + 2)/(N - 2) (N greater than or equal to 4), the domain is an annulus Omega(r) := {x is an element of R-N : r 0, and f : R+ x R+ --> R is a C-1 function, which is a subcritical perturbation.o TEXTO COMPLETO DESTE ARTIGO, ESTARÁ DISPONÍVEL À PARTIR DE AGOSTO DE 2015.1351253