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A disperser is a one-sided extractor. Where an extractor requires that every event gets the same probability under the uniform distribution and the extracted distribution, only the latter is required for a disperser. So for a disperser, an event we have:
Definition (Disperser): A -disperser is a function
such that for every distribution on with the support of the distribution is of size at least .
Graph theory 
An (N, M, D, K, e)-disperser is a bipartite graph with N vertices on the left side, each with degree D, and M vertices on the right side, such that every subset of K vertices on the left side is connected to more than (1 − e)M vertices on the right.
An extractor is a related type of graph that guarantees an even stronger property; every (N, M, D, K, e)-extractor is also an (N, M, D, K, e)-disperser.
Other meanings 
A disperser is a high-speed mixing device used to disperse or dissolve pigments and other solids into a liquid.
See also 
- Ronen Shaltiel. Recent developments in explicit construction of extractors. P. 7.
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