Émile Lemoine
| Émile Michel Hyacinthe Lemoine | |
|---|---|
 |
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| Born |
22 November 1840 Quimper, France |
| Died | 21 February 1912 (aged 71) Paris, France |
| Nationality | French |
| Fields | Mathematics, engineering |
| Institutions | Professor at the École Polytechnique |
| Alma mater | École Polytechnique |
| Doctoral advisor | Charles-Adolphe Wurtz, J. Kioes |
| Doctoral students | Uwe Jannsen |
| Known for | Lemoine point, other geometric work |
Émile Michel Hyacinthe Lemoine (French: [emil ləmwan]; 1840–1912) 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.
Lemoine was born in Quimper, Finistère, on 22 November 1840, the son of a retired military captain who had participated in the campaigns of the First French Empire occurring after 1807. As a child, he attended the military Prytanée of La Flèche on a scholarship granted because his father had helped found the school. During this early period, he published a journal article in Nouvelles annales de mathématiques, discussing properties of the triangle.
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