Locally Lipschitz functions acting between infinite dimensional normed spaces are considered. When the range is a dual space and satisfies the Radon-Nikodym property, a generalized core-Jacobian, Δ f(p) is introduced, and its fundamental properties are established. Primarily, it is shown that the β-closure of its convex hull is exactly the generalized Jacobian. Furthermore, the nonemptiness, the β-compactness, the β-upper semicontinuity, and even another representation are obtained. Connections with known notions are derived and chain rules are proved using key results developed. Therefore, the generalized core-Jacobian introduced in this paper is proved to enjoy all the properties that allow this set to be the nucleus of the generalized Jacobian.

Contact details are reproduced from the original publication and may be historical.

Zsolt Páles

Institute of Mathematics, University of Debrecen, 4010 Debrecen, Pf. 12, Hungary

pales@math.klte.hu

Vera Zeidan

Dept. of Mathematics, Michigan State University, East Lansing, MI 48824, U.S.A.

zeidan@math.msu.edu
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Z. Páles, V. Zeidan. “The Core of the Infinite Dimensional Generalized Jacobian.” Journal of Convex Analysis 16 (2009), No. 2, 321–349. https://doi.org/10.68381/jca16017