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Tangent Cones and Quasi-Interiorly Tangent Cones to Multifunctions

Lionel Thibault
Transactions of the American Mathematical Society
Vol. 277, No. 2 (Jun., 1983), pp. 601-621
DOI: 10.2307/1999227
Stable URL: http://www.jstor.org/stable/1999227
Page Count: 21
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Tangent Cones and Quasi-Interiorly Tangent Cones to Multifunctions
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Abstract

R. T. Rockafellar has proved a number of rules of subdifferential calclus for nonlocally lipschitzian real-valued functions by investigating the Clarke tangent cones to the epigraphs of such functions. Following these lines we study in this paper the tangent cones to the sum and the composition of two multifunctions. This will be made possible thanks to the notion of quasi-interiorly tangent cone which has been introduced by the author for vector-valued functions in [29] and whose properties in the context of multifunctions are studied. The results are strong enough to cover the cases of real-valued or vector-valued functions.

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