2-convexity and 2-concavity in Schatten ideals.

Jameson, Graham J. O. (1996) 2-convexity and 2-concavity in Schatten ideals. Mathematical Proceedings of the Cambridge Philosophical Society, 120 (4). pp. 697-701. ISSN 0305-0041

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Abstract

The properties p-convexity and q-concavity are fundamental in the study of Banach sequence spaces (see [L-TzII]), and in recent years have been shown to be of great significance in the theory of the corresponding Schatten ideals ([G-TJ], [LP-P] and many other papers). In particular, the notions 2-convex and 2-concave are meaningful in Schatten ideals. It seems to have been noted only recently [LP-P] that a Schatten ideal has either of these properties if the underlying sequence space has. One way of establishing this is to use the fact that if (E, E) is 2-convex, then there is another Banach sequence space (F, F) such that x; = x2F for all x ε E. The 2-concave case can then be deduced using duality, though this raises some difficulties, for example when E is inseparable.

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