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Candela, Anna Maria; Salvatore, Addolorata; Sportelli, Caterina
Advanced nonlinear studies, 05/2021, Letnik: 21, Številka: 2Journal Article
The aim of this paper is investigating the existence of one or more weak solutions of the coupled quasilinear elliptic system of gradient type where is an open bounded domain, , and , are -Carathéodory functions on with partial derivatives , respectively , while , are given Carathéodory maps defined on which are partial derivatives of a function . We prove that, even if the coefficients make the variational approach more difficult, under suitable hypotheses functional , related to problem (P), admits at least one critical point in the “right” Banach space . Moreover, if is even, then (P) has infinitely many weak bounded solutions. The proof, which exploits the interaction between two different norms, is based on a weak version of the Cerami–Palais–Smale condition, a “good” decomposition of the Banach space and suitable generalizations of the Ambrosetti–Rabinowitz Mountain Pass Theorems.
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