Abstract.
Using Orlicz-Sobolev spaces and a variant of the Mountain-Pass Lemma of Ambrosetti-Rabinowitz we obtain existence of a (positive) solution to a semilinear system of elliptic equations. The admissible nonlinearities are such that the system is superlinear and subcritical. The Orlicz setting used here allows us to consider nonlinearities which are not (asymptotically) pure powers. Moreover, by an interpolation theorem of Boyd we find an elliptic regularity result in Orlicz-Sobolev spaces. A bootstrapping argument implies that the above mentioned solutions are classical.
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Clément, P., Pagter, B.d., Sweers, G. et al. Existence of Solutions to a Semilinear Elliptic System through Orlicz-Sobolev Spaces. MedJM 1, 241–267 (2004). https://doi.org/10.1007/s00009-004-0014-6
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DOI: https://doi.org/10.1007/s00009-004-0014-6