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An expander graph is a graph in which small sets of vertices have large 'boundary'. Ramanujan graphs are examples of expanders.

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How to prove a random d-regular graph is an expander with prob >= 0.5?

Pinsker's original paper is now available online in the archive of the International Teletraffic Congress: https://itc-conference.org/itc-library/itc07.html Pinsker, Mark S. On the Complexity of a Con …
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