He left Minnesota in 1902 to spend a year in Göttingen where he interacted with Klein, Hilbert, Minkowski, Zermelo, Schmidt, Max Abraham and Carathéodory .
He left Minnesota sa 1902 na gastusin ng isang taon sa kung saan siya Gottingen interacted sa Klein, Hilbert, Minkowski, Zermelo, Schmidt, Max Abraham at Carathéodory.