Stacks of Hats (extra) - Numberphile

Featuring Joe Buhler, continuing from: https://youtu.be/laAtv310pyk
Lionel Levine: http://pi.math.cornell.edu/~levine/
Hat Stack: https://www.brand.site.co.il/riddles/201607a.html

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Видео Stacks of Hats (extra) - Numberphile канала Numberphile2