This was written for the occasion of Klein's inaugural address when he was appointed professor at Erlangen in 1872 although it was not actually the speech he gave on that occasion.
Ito ay isinulat para sa mga okasyon ng Klein's pampasinaya address kapag siya ay hihirangin propesor sa Erlangen sa 1872 bagama't ito ay hindi aktwal na mga pananalita siya sa ibinigay na pagkakataon.