 Departing from Garber and Dear’s view as well as from Popkin’s, Buccolini (2019) presents Mersenne’s epistemological reflection in La vérité des sciences as resolutely anti-sceptical, and strongly connected with the views expressed by the Jesuit mathematician, Guiseppe Biancani, in his dissertation on the nature of mathematics (Biancani 1615), arguing for the certainty and scientific status of mathematics. According to Buccolini, Mersenne’s doubts are directed not against science as such but against the Aristotelian doctrine of demonstratio, his aim being to replace Aristotelian physics with an entirely intelligible mathematical physics.