The Useless Number - Numberphile

One of the first people to stumble over imaginary numbers (namely the square root of -15) thought it was "subtle" and "useless".
More links & stuff in full description below ↓↓↓

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

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Видео The Useless Number - Numberphile канала Numberphile