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Hello there.

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

The Moving Sofa Problem

The Moving Sofa Problem

Additional information

Featuring Dan Romik from UC Davis.

Dan's comprehensive page on this topic: http://bit.ly/movingsofa

Collatz Conjecture in Color

Collatz Conjecture in Color

The Four Color Map Theorem

The Four Color Map Theorem