# Émile Lemoine

## French mathematician

Died when: 71 years 101 days (855 months)Star Sign: Scorpio

Émile Michel Hyacinthe Lemoine (French: [emil l?mwan]; 22 November 1840 – 21 February 1912) was a French civil engineer and a mathematician, a geometer in particular.

He was educated at a variety of institutions, including the Prytanée National Militaire and, most notably, the École Polytechnique.

Lemoine taught as a private tutor for a short period after his graduation from the latter school.Lemoine is best known for his proof of the existence of the Lemoine point (or the symmedian point) of a triangle.

Other mathematical work includes a system he called Géométrographie and a method which related algebraic expressions to geometric objects.

He has been called a co-founder of modern triangle geometry, as many of its characteristics are present in his work.

For most of his life, Lemoine was a professor of mathematics at the École Polytechnique.In later years, he worked as a civil engineer in Paris, and he also took an amateur's interest in music.

During his tenure at the École Polytechnique and as a civil engineer, Lemoine published several papers on mathematics, most of which are included in a fourteen-page section in Nathan Altshiller Court's College Geometry.

Additionally, he founded a mathematical journal titled, L'Intermédiaire des Mathématiciens.