Dror Bar-Natan: Classes: 2003-04: Math 1350F - Knot Theory: | (3) |
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**The Perko Pair: (are these the same?) **
(taken from http://www.math.cuhk.edu.hk/publect/lecture4/perko.html)

**Is this the unknot? **
(From a book by A.B.
Sossinsky. Thanks, Ian Agol)