Abstract

A Banach space X is Grothendieck if the weak and the weak⁎ convergence of sequences in the dual space X⁎ coincide. The space ℓ∞ is a classical example of a Grothendieck space due to Grothendieck. We introduce a quantitative version of the Grothendieck property, we prove a quantitative version of the above-mentioned Grothendieckʼs result and we construct a Grothendieck space which is not quantitatively Grothendieck. We also establish the quantitative Grothendieck property of L∞(μ) for a σ-finite measure μ.

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