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The Useless Number - Numberphile

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Channel: Numberphile
Categories: Math  
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Description

One of the first people to stumble over imaginary numbers (namely the square root of -15) thought it was "subtle" and "useless".
Featuring Barry Mazur.
Extra footage from this interview: http://youtu.be/i4GCd2xOCDg
Barry's book on this topic: http://bit.ly/RootMinusFifteen

Barry on scale and similarity: http://youtu.be/ItiFO5y36kw

NUMBERPHILE
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Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile

Videos by Brady Haran

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