Blasius of Parma

Blasius around 1390 wrote a work on perspective; it drew on Alhacen, John Pecham, and Witelo. Filippo Brunelleschi may have known of the work of Blasius through Giovanni dell'Abbaco. His Tractatus de Ponderibus was based on Oxford theories on laws of motion taken up from the statics of Jordanus Nemorarius, and introduced them into Italy. He disagreed with the views of Thomas Bradwardine on proportion, and gave a proof of the mean speed theorem. He also wrote on the natural philosophy of Aristotle. ==Modern editions==

• Questiones super tractatus logice magistri Petri Hispani, Paris: Vrin, 2001. • Quaestiones circa tractatum proportionum magistri Thome Braduardini, Paris: Vrin, 2006. • Questiones super perspectiva communi, Paris: Vrin, 2009. ==References==