Duns Scotus's Doctrine of Categories and MeaningDuns Scotus's Doctrine of Categories and Meaning is a key text for the origins of Martin Heidegger's concept of "facticity." Originally submitted as a postdoctoral thesis in 1915, it focuses on the 13th century philosopher theologian John Duns Scotus. Heidegger first analyzes Scotus's doctrine of categories, then offers a meticulous explanation of the Grammatica Speculativa, a work of medieval grammar now known to be authored by the Modist grammarian