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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This reminds me of this paper: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.127801 … Gareth would be a good person to ask about this...
6:06 PM - 4 Jun 2019
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