Mathematics – Functional Analysis
Scientific paper
1996-01-26
Mathematics
Functional Analysis
Scientific paper
A Banach space $X$ is said to be Q.H.I. if eve\-ry infinite dimensional quo\-tient spa\-ce of $X$ is H.I.: that is, a space is Q.H.I. if the H.I. property is not only stable passing to subspaces, but also passing to quotients and to the dual. We show that Gowers-Maurey's space is Q.H.I.; then we provide an example of a reflexive H.I. space ${\cal X}$ whose dual is not H.I., from which it follows that $\cal X$ is not Q.H.I.
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