His first teaching post was in the Luisenstädtische Gymnasium in Berlin. However he found both the long hours teaching and the elementary nature of the mathematics he was having to teach made him feel that he was in the wrong profession.
Kanyang unang post ay pagtuturo sa Luisenstädtische himnasyo sa Berlin. Gayunman siya natagpuan pareho ang haba ng oras ng pagtuturo sa elementarya at katangian ng matematika siya ay konektado sa turuan na ginawa sa kanya pakiramdam na siya ay sa maling propesyon.