Author： Bárcenas Diómedes Gurariy Vladimir Sánchez Luisa Ullán Antonio
Publisher： Taylor & Francis Ltd
ISSN： 1607-3606
Source： Quaestiones Mathematicae, Vol.27, Iss.2, 2004-06, pp. : 137-145
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Abstract
We provide an example to show that the moduli of convexity δE and βE are different. Our example allows us to prove that 2 is the best possible constant in the inequality δE ≤ β E ≤ 2 δ E and that βE does not need to be a convex function.
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