Studied in Torino with E. D'Ovidio and F. Faà di Bruno and graduated in 1883. Taught geometry in Torino since 1888.

C. Segre, with E. Bertini, may be considered as the founder of Italian school of algebraic geometry. He was also a member of the Accademia Nazionale dei Lincei.

Main students: G. Castelnuovo, F. Severi, G. Fano, G. Giambelli, E. Togliatti, A. Terracini.

Selected papers reprinted by U.M.I. since 1961 (4 vol., ed. Cremonese).

Main commemorations and studies: F. Severi, in Selected Papers , 5-12; G. Castelnuovo, Rend. della R. Acc. Nazionale dei Lincei , (33), 1924, 353-359; Baker, Boll. dell'Unione Mat. Ital. , 6, 1927, 276-289; G. Loria, Ann. di Mat. pura ed applicata , 2, 1923-24.