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Published online by Cambridge University Press: 20 November 2018
Let E be a real Banach space with norm ρ. Let S={x ∊ E: ρ(x) = 1}. A norm on E is admissible if it generates the same topology as ρ.
The normρ is Gateaux differ-entiable if for each x ∊ S and u ∊ E
exists.