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This is Numberphile. We mainly post videos about mathematics and just numbers in general.

Imaginary Erdős Number

Imaginary Erdős Number

Brady Haran
Ron Graham

Ron Graham on imaginary Erdős Numbers.

More Ron Graham Videos: http://bit.ly/Ron_Graham

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Calculate Erdős Numbers (and collaboration distance) here:
http://www.ams.org/mathscinet/collaborationDistance.html

Infinite Fractions

Infinite Fractions
Math and Movies (Animation at Pixar)

Math and Movies (Animation at Pixar)