- @F_Vaggi @paulg Do you mean Hadamard's book? "The Psychology of Invention in the Mathematical Field"?
Thoughtful and articulate study of the origin of ideas. Role of the unconscious in invention; the medium of ideas — do they come to mind in words? in pictures? in mathematical terms? Much more. "It is essential for the mathematician, and the layman will find it good reading." — Library Journal.