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      The Dynamics of Digits: Calculating Pi with Galperin’s Billiards 

      Mendez Aretxabaleta, Xabier; Gonchenko, Marina; Harshman, Nathan L.; Jackson, Steven Glenn; Olshanii, Maxim; Astrakharchik, Grigory E. (MDPI, 2020-04-02)
      In Galperin billiards, two balls colliding with a hard wall form an analog calculator for the digits of the number π . This classical, one-dimensional three-body system (counting the hard wall) calculates the digits of π ...