He then studied with Picard, Poincaré, Painlevé, Jordan, Darboux, and Goursat at the Sorbonne in Paris from 1898 to 1900.
Kemudian dia belajar di bawah bimbingan Picard, Poincaré, Painlevé, Jordan, Darboux, dan Goursat di Universitas Sorbonne pada tahun 1898 - 1900.