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There is a problem that fascinates me because of how surprising and simple it is. I learned about it in the magnificent book “The Man Who Calculated” and today I am here to explain something about this precious problem and how it appears in many places in mathematics. Subscribe to the channel! Follow Eduardo Sáenz de Cabezón: On Twitter: /edusadeci On Instagram: /eduardosdc On Facebook: www.facebook.com/DerivandoYouTube