Note, however, that it was discovered later that one of the two main sources used by Heidegger was not by Scotus, but by Thomas of Erfurt. Thus Heidegger's 1916 doctoral thesis, Die Kategorien- und Bedeutungslehre des Duns Scotus, should have been entitled, Die Kategorienlehre des Duns Scotus und die Bedeutungslehre des Thomas von Erfurt. Source: Stanford Encyclopedia of Philosophy.
