Turin 1908-Rho 1991. Philosopher, mathematician and epistemologist. Graduated in Philosophy in 1930 from the University of Turin and in Mathematics in 1932. With a broad European outlook, he refused to join the Fascist Party, thus putting to an end any academic career. A member of the Communist Party he was a partisan in Piedmont and municipal councillor in Turin. From 1949 he taught at the University of Cagliari, later in Pavia and then, for many years, in Milan as the first professor of Philosophy of Science in Italy. Director of the editing committee of the Enciclopedia della scienza e della tecnica.