Locally convex spaces, Weak τ-functions, Ekeland’s variational principle, K-lower semicontinity from above, Lower closedness,

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We propose relaxed lower semicontinuity properties for set-valued mappings, using weak τ -functions, and employ them to weaken known lower semicontinuity assumptions to get enhanced Ekeland's variational principle for Pareto minimizers of set-valued mappings and underlying minimal-element principles. Our results improve and recover recent ones in the literature.

We propose several additional kinds of semi-limits and corresponding notions of semicontinuity of a set-valued map. They can be used additionally to known basic concepts of semicontinuity to have a clearer insight of local behaviors of maps. Then, we investigate semicontinuity properties of solution maps to a general parametric quasivariational inclusion, which is shown to include most of optimization-related problems. Consequences are derived for several particular problems. Our results are new or generalize/improve recent existing ones in the literature.