This volume contains the following contributions:

The Language of “Idealities” : Interview of  J.T. Desanti by M.A. Sinaceur–  Résistances (Simone Debout);  Innovation and Scientific System (Sylvain Auroux);  Nicomaque of Gerasa and Eratosthen’s Riddle (Bernard Besnier);  What is an Artefact in the History of Sciences?  (Maurice Caveing);  Signal and Writing (Gérard Granel);  On the Hardness of Sense (Patrice Loraux);  Psychical Analysis and the Splitting Up of Man  (P-F Moreau);  Mathematical Idealities and Objective Reality (Jean Petitot);  An Armed Philosopher (René Schérer);  The Abilities of a Body (Bernard Sichère);  Logic : Ordinary Mathematics or Genuine Epistemology (Hourya Sinaceur).