Abstract
lntentional ontology. Heidegger and the transformation of Husserlian phenomenology. The article will look inside in what Heidegger said in his first course in Marburgo about the issue of intentionality as the basis for a “fundamental ontological investigation.” Through the first Heidegger’s lessons, especially Freiburg, aspects of the Husserl’s idea of intentionality who suffered a hermeneutic appropriation by Heidegger, will be deployed. The text will focus on the relationship between Husserl’s intentionality and categorial intuition in order to interpret them through the light of hermeneutic and understanding intuition that Heidegger speaks in his 1919’s Kriegsnotsemester.