Geodesic
On the Closedness of the Sum of Closed Convex Cones in Reflexive Banach Spaces
Journal of convex analysis, Tome 14 (2007) no. 1, pp. 99-102 
E. Beutner. On the Closedness of the Sum of Closed Convex Cones in Reflexive Banach Spaces. Journal of convex analysis, Tome 14 (2007) no. 1, pp. 99-102. http://geodesic.mathdoc.fr/item/JCA_2007_14_1_JCA_2007_14_1_a6/
@article{JCA_2007_14_1_JCA_2007_14_1_a6,
     author = {E. Beutner},
     title = {On the {Closedness} of the {Sum} of {Closed} {Convex} {Cones} in {Reflexive} {Banach} {Spaces}},
     journal = {Journal of convex analysis},
     pages = {99--102},
     year = {2007},
     volume = {14},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JCA_2007_14_1_JCA_2007_14_1_a6/}
}
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Voir la notice de l'article provenant de la source Heldermann Verlag

We establish a sufficient condition for the sum of two closed convex cones K and L of a reflexive Banach space to be closed.