Geodesic
On the Closure of the Convex Hull of a Set
Canadian mathematical bulletin, Tome 18 (1975) no. 1, pp. 147-148

Voir la notice de l'article provenant de la source Cambridge University Press

Let Y be a linear space over the complex plane C, and let F be a mapping on the complex linear space Y ⊕ C into subsets of C with the following properties: for y ∊ Y, λ and μ ∊ C, F(y + μ) is a nonempty and bounded subset of C, F(λy + μ) = λF(y) + μ and F(μ) = {μ}. We shall write f(y + μ) = sup{|λ + μ|: λ ∊ F(y)}, the radius of F(y + μ), y ∊ Y and μ ∊ C. The convex hull (resp. the closure) of a subset M of C is denoted by conv M (resp. ). 
Lin, C.-S. On the Closure of the Convex Hull of a Set. Canadian mathematical bulletin, Tome 18 (1975) no. 1, pp. 147-148. doi: 10.4153/CMB-1975-028-x
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