# Karl Wilhelm Feuerbach

**Karl Wilhelm Feuerbach** (

1800-

1827) was a

German geometer. After receiving his doctorate at age 22, he became a professor of

mathematics at the

Gymnasium at

Erlangen. In

1822 he wrote a small book on mathematics noted mainly for a theorem at the bottom of one of the pages on the

nine point circle. Shortly before his death he introduced

homogeneous coordinates, independent of

Möbius.