BK21-5 Principia Mathematica

Book 1321 … Part 5 ….. Principia Mathematica by Russell and Whitehead …. secret codes translated by Herb Zinser

https://www.storyofmathematics.com/

The Story of Mathematics › 20th_russell

Bertrand Russell and Alfred North Whitehead were British mathematicians, ... decade of the 20th Century on their monumental work, the “Principia Mathematica”.