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Cores of Tangent Cones and Clarke's Tangent Cone

Mathematics of Operations Research, 1985
It is known that Clarke's tangent cone at any point of any subset of Rn is always both unique and convex. By contrast, nearly all other notions of convex tangent cone in the literature are monotone in the sense that if a convex cone K is a tangent cone at a point x0 of a set C ⊆ Rn, then K′ ⊆ K, C ⊆ C′ automatically implies that K′ is a tangent cone ...
D. H. Martin, G. G. Watkins
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