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Convex unconditionality and summability of weakly null sequences

Spiros A. Argyros, S. Merkourakis, A. Tsarpalias

math.FAarXiv:math/9512209

Abstract

It is proved that every normalized weakly null \ has a sub\ which is convexly unconditional. Further, an Hierarchy of summability methods is introduced and with this we give a complete classification of the complexity of weakly null s.

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