Lacunary matrices

Details Lacunary matrices Lacunary matrices

2001-02-27

arxiv.org/abs/math/0102211v1

Mathematics

Functional Analysis

14 pages

Scientific paper

We study unconditional subsequences of the canonical basis e_rc of elementary matrices in the Schatten class S^p. They form the matrix counterpart to Rudin's Lambda(p) sets of integers in Fourier analysis. In the case of p an even integer, we find a sufficient condition in terms of trails on a bipartite graph. We also establish an optimal density condition and present a random construction of bipartite graphs. As a byproduct, we get a new proof for a theorem of Erdos on circuits in graphs.

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