Dover Publications Inc. | 1954 | 145 páginas | DJVU | 6 MB
on-line: archive.org
rapidshare.com
depositfiles.com
rapidshare.com
rapidshare.com
scribd.com
4shared.com
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.
