books.google.fr - Charles Sanders Peirce (1839-1914) is rapidly becoming recognized as the greatest American philosopher. At the center of his philosophy was a revolutionary model of the way human beings think. Peirce, a logician, challenged traditional models by describing thoughts not as "ideas" but as "signs," external...http://books.google.fr/books/about/Peirce_on_signs.html?hl=fr&id=OgRazXzttrwC&q=conclusion&utm_source=gb-gplus-sharePeirce on signs
