In memory of Elwyn Berlekamp, who passed away on 9th April, Colin Wright has shared with us this post from his blog.
I remember meeting Elwyn Berlekamp.
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π, Phase Space, and Bouncing Billiard Balls
There are many ways to estimate or calculate π, that number that is irrational, but well-rounded. But perhaps none is as remarkable as that outlined in a 2013 paper by G. Galperin. In this brief article we’ll have a look at the problem, and see the setting, although we’ll leave the interested reader to hunt down the details.