Raphson toeing the line on:
(1) Leibniz only devised his own notation to disguise his theft, and,
(2) It is a bad notation

The ride-or-die Royal Society outlook pic.twitter.com/480QRIdwyt

— Clare Moriarty (@quiteclare) July 15, 2020

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