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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.
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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
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65:. Lemoine taught as a private tutor for a short period after his graduation from the latter school.
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in particular. He was educated at a variety of institutions, including the
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on mathematics, most of which are included in a fourteen-page section in
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Lemoine is best known for his proof of the existence of the
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113:L'intermédiaire des mathématiciens
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72:(or the symmedian point) of a
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80:and a method which related
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