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Re:The Math of Card Shuffling (2018) by FabHK on Thursday August 06, 2020 @06:30PM (#24076117)
For more than you ever wanted to know on the mathematics of a perfect shuffle, see this paper:

http://statweb.stanford.edu/~cgates/PERSI/papers/83_05_shuff...

I saw one of the authors, Persi Diaconis, give a talk on this paper, and then perform a perfect shuffle. I was floored.

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