Olry Terquem (
1782 -
1862) was a
French mathematician, best known for his work in
geometry, where he proved the Feuerbach's theorem about the
nine point circle of a given
triangle. As one of the editors of the
Nouvelles Annales[?] he published in
1842 the second analytical proof of the Feuerbach's theorem that the nine point circle touches the
incircle and the
excircles of a triangle.
Terquem was among the first who has recognized great Galois work.