Evolution of the notation for the empty set Posted on 2020/07/04 by Carl Robitaille Evolution of the notation for the empty set:0 – George Boole 🇬🇧 (1847)𝑂 – Georg Cantor 🇩🇪 (1880){} – Gottlob Frege 🇩🇪(1882)Λ – Giuseppe Peano 🇮🇹 (1889)∅ – Andre Weil 🇫🇷 (1939)— Fermat's Library (@fermatslibrary) July 4, 2020