At Berlin, unlike Münster, he found the highest quality of teaching and he was particularly influenced by Kummer, Weierstrass and Helmholtz . He interrupted his studies in 1870-71 when his father asked him to return to help at the school in Rüthen.
Sa Berlin, hindi katulad Munster, siya natagpuan ang pinakamataas na kalidad ng pagtuturo at siya ay lalo na naiimpluwensyahan ng Kummer, Weierstrass at Helmholtz. He interrupted kanyang pag-aaral sa 1870-71 kapag ang kanyang ama nagtanong sa kanya upang bumalik sa tulong at sa paaralan sa Rüthen.