Erudite commentaries on physics, natural philosophy and Aristotelian metaphysics. His teaching of Aristotelian philosophy was placed in a critical and non-scholastic way, even in the wake of Thomism. The author is known among other things for having been on good terms with Pietro Pomponazzi, who had asked for help in order to re-edit his work De immortalitate animi; following the unfortunate events of the Mantuan philosopher, condemned for his treatise, Giavelli was commissioned by the inquisitors to review the work, and it was even established that the works of these could not be published without the observations of the Dominican Javelli.