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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.
6
votes
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 …