Ludolph Lehmus — Wikipedia

Daniel Christian Ludolph Lehmus (born the July 3, 1780 to Soest, died on January 18, 1863 (at 82) in Berlin) is a German mathematician. He left his name to the Steiner-Lehmus theorem.

His grandfather is Johann Adam Lehmus, poet. His father, Christian Balthasar, director of a gymnasium, made his education at home.

From 1799 to 1802 he studied at the universities of Jena and Erlangen. He went to Berlin in 1803. After giving private lessons, he became Privatdozent at the University of Berlin of December 1813 at Easter 1815.

In 1814, he began to teach at the Hauptbergwerks-Eleven Institute (a Mines School). From 1826, he also taught at the combined artillery and genius school. He received the title of professor in 1827 and his work earned him in 1836 to become a member of the Order of the Red Eagle.

Until 1837 he gave lessons at university ^{[ first ] , [ 2 ]} .

Emilie Lehmus (in) , first female-medicine in Berlin, was his niece.

Lehmus contributed to Journal Für Die Reine und Angewandte Mathematik (Pure and Applied Mathematics Journal) , also known as Crelle Journal .

In 1836 he was the first German mathematician to make a contribution to the study of the Strophoid ^{[ 3 ]} .

He published in 1820 an elegant trigonometric solution of the problem of malfatti ^{[ 4 ]} . in the Annals of pure and applied mathematics , but a typographer error makes her name appear there as “lechmütz” ^{[ 2 ]} .

In 1840 Lehmus wrote a letter to Jacques Charles François Sturm, asking for an elementary geometric demonstration of what was going to be the theorem of Steiner-Lehmus. Sturm made the request to other mathematicians and Jakob Steiner demonstrated the theorem; Lehmus, in 1850, produced his own demonstration ^{[ 5 ] , [ 6 ]} .

Unless otherwise stated, Lehmus’ work is in German.

• Tasks from body theory , Berlin – Halle, 1811
• Textbook of number-arithmetics, letter data art and algebra , Leipzig, 1816
• Textbook of applied mathematics , vol.  I-III, Berlin, 1818, 1822 :
• Theory of the crooked apple , Berlin, 1818
• The first simplest basic concepts and teaching of the higher analysis and curven theory , Berlin, 1819
• (fr) ‘ New solution of the problem where it involves registering for any given triangle three circles such as each of them affects the other two and two sides of the triangle “, In Annals of pure and applied mathematics , 1820
• Exercise tasks on teaching from the largest and the smallest , Berlin, 1823
• Geometry textbook , Berlin, 1826
• Collection of dissolved tasks in the field of applied mathematics , Berlin, 1828
• Basic teaching of higher mathematics and mechanical sciences , Berlin, 1831
• Application of the higher calcul for geometric and mechanical, especially ballistic tasks , Leipzig, 1836
• Short guide for the lecture of higher analysis, higher geometry and analytical mechanics , Duncker and Humblot, 1842 sur Google Livres
• Algebraic tasks from all over the area of ​​pure mathematics with indication of the results , Duncker and Humblot, Berlin, 1846 sur Google Livres
• Border determinations in comparison of circles that depend on the same triangle, both among themselves and with the triangle itself , Leipzig, C. Geibel, 1851 on Google Books

• (in) Diane et Roy Dowling, ‘ The lasting legacy of Ludolph Lehmus » ^{( Archive.org • Wikiwix • Archive.is • Google • What to do ?)} , In Manitoba Math Links , 2, 3, 2002, p. 3–4
• (of) Wilhelm wives, « Lehmus (Daniel Christian Ludolph) “, In Scholarship Berlin in 1845 , Berlin, T. Scherk, 1846, p. 209

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This article owes its first versions to the corresponding articles of the German and English Wikipedias.