Abstract
It is shown that for 1 ≦p < ∞, any basisC-equivalent to the unit vector basis ofl p n has a (1 + e)-symmetric block basis of cardinality proportional ton/logn. When 1 <p < ∞, an upper bound proportional ton log logn/logn is also obtained. These results extend results of Amir and Milman in [2].
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