 Paul wrote many philosophical and theological treatises (the complete list of his writings and a guide to extant manuscripts are in Perreiah 1986; for the dating of his main philosophical works see Conti 1996, pp. 9–20), including: Logica parva (The Small Logic), ca. 1393–95; Logica magna (The Great Logic—LM), ca. 1396–99; Sophismata aurea (Golden Sophisms), ca. 1399; a commentary on Aristotle’s Posterior Analytics (In Post.), C.E. 1406; Summa philosophiae naturalis (Summa of Natural Philosophy—SN), C.E. 1408; a commentary on Aristotle’s Physics (In Phys.), C.E. 1409; a commentary on Aristotle’s On the Soul (In De anima), ca. 1415–20; Quaestio de universalibus (On Universals—QdU), ca. 1420–24; a commentary on Aristotle’s Metaphysics (In Metaph.), ca. 1420–24; a commentary on the Ars Vetus, that is, on Porphyry’s Isagoge, Aristotle’s Categories, and the Liber sex principiorum (Expositio super Universalia Porphyrii et Artem Veterem Aristotelis—In Porph., In Cat., and In Sex pr. respectively), C.E. 1428.