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Existence results for a class of variational quasi-mixed hemivariational-like inequalities. (English) Zbl 1491.49008

Summary: The paper aims to explore the existence results for a class of variational quasi-mixed hemivariational-like inequality problems with nonlinear terms in reflexive Banach spaces, which contain variational and hemivariational inequalities. We make use of stable \((\eta,\psi)\)-quasimonotonicity, KKM theorem, Clarke’s generalized directional derivative and Clarke’s generalized gradient to derive the existence theorems for the condition of the constrained set being bounded. Further, we obtain the solution’s existence results when the constrained set is unbounded by utilizing suitable coercive conditions. Moreover, we present some sufficient conditions to assure the boundedness of the solutions set. Besides, we also demonstrate a necessary and sufficient criteria for a restricted class of variational quasi-mixed hemivariational-like inequality problems. Several applications of the main results are illustrated. The new developments improve and generalize some well-known works.

MSC:

49J40 Variational inequalities
47J20 Variational and other types of inequalities involving nonlinear operators (general)
49J27 Existence theories for problems in abstract spaces
Full Text: DOI

References:

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