Travailler par fiches. L’ordre matériel du savoir géométrique dans le Schedario Segre

This paper is dedicated to the history of an extremely particular manuscript: Segre's personal card index. Consisting of 515 handwritten cards on which he annotated bibliographic references and excerpts of readings that could be useful in his research and teaching, Segre's Schedario is the manuscript catalogue of a virtual library, a sort of reasoned bibliography that photographs the cultural heritage of Corrado Segre and, more generally, of an Italian geometer of the Belle Epoque. In this paper, we will analyze how Segre constructed, organized and used the Schedario in order to retain and mobilize geometric knowledge.