Almost Optimal Dispersers

A disperser is a bipartite graph with the property that every subset A of of cardinality at least K, has at least fraction of the vertices of as neighbors. Such graphs have many applications in derandomization. Saks, Srinivasan and Zhou presented an explicit construction of a disperser with an almost optimal degree , for every . We extend their result for every parameter .

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Received November 12, 1998/Revised June 20, 2000


ID="*" This work was partially done while the author was at the Department of Computer Science, Weizmann Institute of Science, Rehovot, Israel. This work was supported by a Phil Zacharia postdoctoral fellowship.

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Ta-Shma, A. Almost Optimal Dispersers. Combinatorica 22, 123–145 (2002).

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  • AMS Subject Classification (2000) Classes:  68Q01, 68R10