Geodesic
A Characterization of Hyers--Lang Differentiability in Terms of a Tangent Cone
Matematičeskie zametki, Tome 89 (2011) no. 2, pp. 214-225.

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We introduce the notion of Hyers–Lang tangent cone to a subset of a topological vector space, and give a characterization, for the case of locally convex topological vector spaces, of Hyers–Lang differentiability in terms of the Hyers–Lang tangent cone to the graph.
Keywords: Hyers–Lang differentiability, Hyers–Lang tangent cone, locally convex topological vector space, balanced neighborhood. 
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P. Vojčák. A Characterization of Hyers--Lang Differentiability in Terms of a Tangent Cone. Matematičeskie zametki, Tome 89 (2011) no. 2, pp. 214-225. http://geodesic.mathdoc.fr/item/MZM_2011_89_2_a4/

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