Abstract

In this paper, we present an example in which the sum of two maximal abstract monotone operators is maximal. Also, we shall show that the necessary condition for Rockafellar's surjectivity which was obtained in ((19), Theorem 4.3) can be sufficient. Abstract convexity has found many applications in the study of problems of mathematical analysis and optimization. Abstract convexity has mainly been used for the study of point-to-point functions. Examples of its use in the analysis of multifunctions can be found in (3, 13, 14, 24). Several approaches to the theory of monotone multifunctions have established links between maximal monotone multifunctions and convex functions (see

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