Geodesic
Linear Normed Spaces with Extension Property
Canadian mathematical bulletin, Tome 9 (1966) no. 4, pp. 433-441

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

In this paper we shall say “E has the (F, G) (extension) property” to mean the following: F is a subspace of the real normed linear space G, E is a real normed linear space, and any bounded linear mapping F→E has a linear extension G→E with the same bound (equivalently, every linear mapping F→E of bound 1 has a linear extension G→E with bound 1). 
Elliott, George; Halperin, Israel. Linear Normed Spaces with Extension Property. Canadian mathematical bulletin, Tome 9 (1966) no. 4, pp. 433-441. doi: 10.4153/CMB-1966-052-6
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