Necessary Conditions for Multiple Integral Problem in the Calculus of Variations.
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Viorel Barbu (1982)
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Michael Struwe (1982)
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We discuss the existence and multiplicity of positive solutions for a class of second order quasilinear equations. To obtain our results we will use the Ekeland variational principle and the Mountain Pass Theorem.
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Demeter Krupka (1976)
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