Mayer, Pierre Keywords: Judicial competence | International commercial arbitration | Mots clefs: Compétence judiciaire | Arbitrage commercial international | ABSTRACT Pierre Mayer, Professor at the University of Paris I, notes that a course on the competence of international arbitrators may adopt two different approaches depending on whether it is from the point of view of States or arbitrators. The author chooses the second. However, an arbitrator ruling in Geneva on a dispute between an American party and an Ital…