Mathematics – Functional Analysis
Scientific paper
2005-05-10
Mathematics
Functional Analysis
Scientific paper
We provide a new proof of James' sup theorem for (non necessarily separable)
Banach spaces. One of the ingredients is the following generalization of a
theorem of Hagler and Johnson (1977) : "If a normed space $E$ does not contain
any asymptotically isometric copy of $\ell^1(\IN)$, then every bounded sequence
of $E'$ has a normalized block sequence pointwise converging to 0".
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