There were two reasons: Furtwängler was an outstanding mathematician and teacher, but in addition he was paralysed from the neck down so lectured from a wheel chair with an assistant who wrote on the board.
May mga dalawang dahilan: Furtwängler ay isang natitirang dalubbilang at guro, ngunit sa karagdagan siya ay paralisado mula sa leeg pababa kaya lectured mula sa isang wheel chair sa isang assistant na nag-wrote sa board.