Assesses some of the claims on the modified version of Euler and Venn diagrams. Focus on logical diagrams; Examination of the relationship between Peirce diagrams and boolean formulas; Quantitative...

The most familiar scheme of diagrams used in logic is known as Euler's circles. It is named after the mathematician Leonhard Euler who popularized it in his Letters to a German Princess (1768)....

From the Robin Catalogue:
A. MS., G-1905-1e, pp. 1-65; 33-40; 38-41; 37-38; 40-43.7; plus 64 pp. of fragments running brokenly from p. 1 to p. 60.
This was to have...