Abstract
In this article, it is considered the existence of nonzero solutions for a semilinear elliptic system. First, the existence of one nonzero solution is obtained by applying a version of the generalized mountain pass theorem. Next, a maximum principle is used to derive the existence of a positive and a negative solution. Finally, the generalized Morse theory is used to provides the exist ence of at least three nonzero solutions when the primitive of the nonlinearity has a superquadratic behaviour at infinity.
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