Abstract of a paper by Ohad Giladi and Assaf Naor
This is an announcement for the paper "Improved bounds in the scaled Enflo type inequality for Banach spaces" by Ohad Giladi and Assaf Naor. Abstract: It is shown that if (X,||.||_X) is a Banach space with Rademacher type p \ge 1, then for every integer n there exists an even integer m < Cn^{2-1/p}log n (C is an absolute constant), such that for every f:Z_m^n --> X, \Avg_{x,\e}[||f(x+ m\e/2)-f(x)}||_X^p] < C(p,X) m^p\sum_{j=1}^n\Avg_x[||f(x+e_j)-f(x)||_X^p], where the expectation is with respect to uniformly chosen x \in Z_m^n and \e \in \{-1,1\}^n, and C(p,X) is a constant that depends on p and the Rademacher type constant of X. This improves a bound of m < Cn^{3-2/p} that was obtained in [Mendel, Naor 2007]. The proof is based on an augmentation of the ``smoothing and approximation'' scheme, which was implicit in [Mendel, Naor 2007]. Archive classification: math.FA math.MG Mathematics Subject Classification: 46B07, 46B20, 51F99 Submitted from: giladi@cims.nyu.edu The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/1004.4221 or http://arXiv.org/abs/1004.4221
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