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ON NONLINEAR ELLIPTIC HEMIVARIATIONAL INEQUALITIES OF SECOND ORDER
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作者 leszek gasinski Nikolaos S.Papageorgiou 《Acta Mathematica Scientia》 SCIE CSCD 2004年第3期451-462,共12页
In this paper, a nonlinear hemivariational inequality of second order with a forcing term of subcritical growth is studied. Using techniques from multivalued analysis and the theory of nonlinear operators of monotone ... In this paper, a nonlinear hemivariational inequality of second order with a forcing term of subcritical growth is studied. Using techniques from multivalued analysis and the theory of nonlinear operators of monotone type, an existence theorem for the Dirichlet boundary value problem is proved. 展开更多
关键词 Locally Lipschitz function Clarke subdifferential measurable selection pseudomonotone operator GENERALIZED coercive operator Rayleigh quotient surject operator
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POSITIVE SOLUTIONS FOR PARAMETRIC EQUIDIFFUSIVE p-LAPLACIAN EQUATIONS
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作者 leszek gasinski Nikolaos S.PAPAGEORGIOU 《Acta Mathematica Scientia》 SCIE CSCD 2014年第3期610-618,共9页
We consider a parametric Dirichlet problem driven by the p-Laplacian with a Caratheodory reaction of equidiffusive type. Our hypotheses incorporate as a special case the equidiffusive p-logistic equation. We show that... We consider a parametric Dirichlet problem driven by the p-Laplacian with a Caratheodory reaction of equidiffusive type. Our hypotheses incorporate as a special case the equidiffusive p-logistic equation. We show that if λ1 〉 0 is the principal eigenvalue of the Dirichlet negative p-Laplacian and )λ 〉 λ1 (/k being the parameter), the problem has a unique positive solution, while for )λ ∈ (0, λ1], the problem has no positive solution. 展开更多
关键词 P-LAPLACIAN p-logistic equation first eigenvalue equidiffusive reaction maxi-mum principle nonlinear regularity
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Existence Theorems for Periodic Differential Inclusions in IR^N
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作者 Michael Filippakis leszek gasinski Nikolaos S.Papageorgiou 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 2004年第2期179-190,共12页
We study the periodic problem for differential inclusions in R^N.First we look for extremal periodicsolutions.Using techniques from multivalued analysis and a fixed point argument we establish an existencetheorem unde... We study the periodic problem for differential inclusions in R^N.First we look for extremal periodicsolutions.Using techniques from multivalued analysis and a fixed point argument we establish an existencetheorem under some general hypotheses.We also consider the“nonconvex periodic problem”under lowersemicontinuity hypotheses,and the“convex periodic problem”under general upper semicontinuity hypotheseson the multivalued vector field.For both problems,we prove existence theorems under very general hypotheses.Our approach extends existing results in the literature and appear to be the most general results on the nonconvexperiodic problem. 展开更多
关键词 Differential inclusion MULTIFUNCTION upper and lower semicontinuity extremal periodic solution Schauder fixed point theorem property u weak norm Hartman condition
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