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・ Ernst I, Duke of Saxe-Altenburg
・ Ernst I, Prince of Hohenlohe-Langenburg
・ Ernst Ihbe
・ Ernst II of Saxony
・ Ernst II, Duke of Saxe-Altenburg
・ Ernst II, Prince of Hohenlohe-Langenburg
・ Ernst Immanuel Bekker
・ Ernst Immanuel Cohen Brandes
・ Ernst Ising
・ Ernst J. Eichwald
・ Ernst J. Grube
・ Ernst J. Hoesly
・ Ernst Jaakson
・ Ernst Jacobi
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Ernst Jacobsthal
・ Ernst Jaeckh
・ Ernst Jakob Henne
・ Ernst Jandl
・ Ernst Jansa
・ Ernst Jansen Steur
・ Ernst Jansz
・ Ernst Jean-Joseph
・ Ernst Jedliczka
・ Ernst Jentsch
・ Ernst Joachim Förster
・ Ernst Johann Eitel
・ Ernst Johann Schmitz
・ Ernst Johann von Biron
・ Ernst Johansson


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Ernst Jacobsthal : ウィキペディア英語版
Ernst Jacobsthal
Ernst Erich Jacobsthal (16 October 1882, Berlin – 6 February 1965, Überlingen)〔
〕 was a German mathematician, and brother to the archaeologist Paul Jacobsthal.
In 1906, he earned his PhD at the University of Berlin, where he was a student of Georg Frobenius, Hermann Schwarz and Issai Schur; his dissertation, ''Anwendung einer Formel aus der Theorie der quadratischen Reste'' (''Application of a Formula from the Theory of Quadratic Remainders''), provided a proof that prime numbers of the form 4''n'' + 1 are the sum of two square numbers. In 1934, he was fired from his professorship at the Technische Hochschule Berlin, because of his Jewish origins. In 1939 he fled to Norway and became after the war a professor at the technical university of Trondheim.
〔〔
(【引用サイトリンク】Ernst Jacobsthal )

== See also ==

* Jacobsthal sum
* Jacobsthal number
* Fermat's theorem on sums of two squares

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