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)