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Sum of Natural Numbers (second proof and extra footage)

448,373

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Published on Jan 11, 2015

MAIN VIDEO IS AT: http://youtu.be/w-I6XTVZXww

Ed Copeland and Tony Padilla are physicists at the University of Nottingham.

Website: http://www.numberphile.com/
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Videos by Brady Haran

Brown papers: http://bit.ly/brownpapers

A run-down of Brady's channels: http://bit.ly/bradychannels

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