Christian Heinrich von Nagel

Christian Heinrich von Nagel (born February 28, 1803 in Stuttgart ; † October 27, 1882 in Ulm ) was a German mathematician of the 19th century who mainly dealt with geometric topics.

After attending grammar school, von Nagel entered the Evangelical Theological Seminary in Blaubeuren in 1817 . From 1821 to 1825 he studied theology for four years at the Evangelical Monastery in Tübingen . After graduating, Nagel, who was interested in mathematics at an early age, became a teacher of mathematics and natural sciences at the Lyceum and the secondary school in Tübingen. As early as 1826, he received his doctorate at the Philosophical Faculty there on the subject of De triangulis rectangulis ex algebraica aequatione construendis (About right triangles that can be constructed with the help of an algebraic equation). Nagel worked as a private lecturer in Tübingen until 1830. In that year he moved to Ulm, where he got a better paid position as a teacher at the high school in Ulm ; later he became rector of the affiliated Realinstitut.

The best-known research results of Nagels belong to the triangle geometry . One of the distinctive points of the triangle , the nail point , was named after him.

Works

• De triangulis rectangulis ex algebraica aequatione construendis (About right triangles that can be constructed with the help of an algebraic equation), 1826
• Studies of the properties of the main circles related to the triangle. Program of the Ulm High School, Ulm 1835
• Investigations on the most important circles belonging to the triangle. A treatise from the field of pure geometry , Leipzig, 1836

literature

• Peter Baptist: Christian Heinrich von Nagel (1803-1882). Elementary meters and teachers. In: Baussteine ​​zur Tübingen University History, Volume 6 (1991), SS 77–90, ISBN 3-89308-183-6 .

• Peter Baptist: The development of the newer triangular geometry, BI-Wissenschaftsverl., Mannheim 1992, ISBN 3-411-15661-9 .

• Peter Baptist:  Nagel, Christian Heinrich von. In: New German Biography (NDB). Volume 18, Duncker & Humblot, Berlin 1997, ISBN 3-428-00199-0 , p. 709 f. ( Digitized version ).
• Peter Baptist: Historical Notes on Gergonne and Nagel Points. In: Sudhoffs Archiv 71, 1987, 2, pp. 230-233
• Moritz Cantor :  Nagel, Christian Heinrich von . In: Allgemeine Deutsche Biographie (ADB). Volume 23, Duncker & Humblot, Leipzig 1886, p. 214.
• Frank Raberg : Biographical Lexicon for Ulm and Neu-Ulm 1802-2009 . Süddeutsche Verlagsgesellschaft im Jan Thorbecke Verlag, Ostfildern 2010, ISBN 978-3-7995-8040-3 , p. 288 f .