Who cares about topology? (Inscribed rectangle problem)

An unsolved conjecture, the inscribed square problem, and a clever topological solution to a weaker version of the question, the inscribed rectangle problem (Proof due to H. Vaughan, 1977), that shows how the torus and mobius strip naturally arise in mathematical ponderings. Patreon: https://www.patreon.com/3blue1brown Get 10% your domain name purchace from https://www.hover.com/, by using the promo code TOPOLOGY. Special shout out to the following patrons: Dave Nicponski, Juan Batiz-Benet, Loo Yu Jun, To

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