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Recreational mathematics or puzzles with serious mathematical content. Note that math contest problems are generally considered off-topic.

97 votes
11 answers
13k views

Is it possible to capture a sphere in a knot?

You and I decide to play a game: To start off with, I provide you with a frictionless, perfectly spherical sphere, along with a frictionless, unstretchable, infinitely thin magical rope. This rope ha …