Workshop „ Influences on the Aufbau “ July 1 - 3 , 2013 LMU

Andre Carus (Hegeler Institute): “Carnap and Phenomenology: What Happened in 1924?” Abstract: The sketch of the Aufbau system in "Vom Chaos zur Wirklichkeit" (1922) employs phenomenology to describe the system basis, as do other writings before 1924. But in January 1925, we find a new principle of " ̈Überwindung der Subjektivität" and a new emphasis on "Einheit des Gegenstandsbereichs." Russell's "construction principle" becomes the motto of the published book. The earlier approach is explicitly rejected. Why this radical change? This question is discussed here on the basis of evidence from Carnap's papers, and a somewhat unexpected conclusion is reached.