Jorda Mora, Enrique; Zarco, Ana María(HELDERMANN VERLAG, LANGER GRABEN 17, LEMGO, GERMANY, 32657, 2019)
[EN] A well known criterion of Smulyan states that the norm parallel to.parallel to of a real Banach space X is Gateaux differentiable at x is an element of X if and only if there is x* is an element of S-X* which is ...