Here's a topological curiosity I came across when playing with https://twitter.com/KangarooPhysics/status/1135989061976563715 …. It starts as the Seifert surface of a trefoil knot, but then I pull part of the knot through itself so the boundary becomes an unknot, yet the surface cannot be smoothly deformed to a disk.pic.twitter.com/FfsBihxI0y
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Really nice to see this process. This agrees with
@akivaw's answer herehttps://twitter.com/akivaw/status/1136104159810326528?s=09 …
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