Chris Hefele on X: "To #playwithmath, I used some leftover PVC pipe to make a couple versions of a trefoil knot (the simplest torus knot in knot theory). https://t.co/42NYzNoBAf https://t.co/c5WjJgmBKv https://t.co/2RLpLD9n0F #trefoilknot #
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