Variational principles on metric and uniform spaces

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Minimal element theorems and Ekeland's principle with set relations (2006, background): “A detailed approach to ordering relations on power sets as well as links to several algebraic concepts can be found in [12].”
A Duality Theory for Set-Valued Functions I: Fenchel Conjugation Theory (2009, background): “A 2C B () A B C. See, for instance [31], [8], [27], [ 21 ].”
Solution concepts in vector optimization: a fresh look at an old story (2011, background): “Note that an addition and a multiplication by nonnegative real numbers can be introduced in I so that it is possible to deal with convexity; see [17,22] for more details and [13] for the underlying algebraic structures.”