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Mathias Caspar Hubert Isenkrahe (May 12, 1844 in Müntz near Jülich – August 12, 1921 in Trier) was a German mathematician, physicist and catholic philosopher of nature. == Life == Caspar Isenkrahe grew up without a father, who died before Caspar's birth. Isenkrahe visited in 1856 the Progymnasium in Jülich, 1857 the Marzellengymnasium in Cologne and 1858 – 1863 the Realprogymnasium in Bonn. In 1868 he studied at the University of Bonn where he chose the subjects mathematics, physics, chemistry, mineralogy, botany, zoology, philosophy, Latin and German. On July 31, 1866 he made his PhD with an award-winning work about the anatomy of Helicina titanica, a species of snail. He become a teaching authority as a senior primary school teacher (pro facultate docendi) on February 26, 1869 for his chosen courses. After a probationary year 1869/1870 at the high school of Bonn, he worked at the high school of Krefeld (at least to 1878) and then at the Realprogymnasium in Bonn. In the hope to be able to change to a high school career at the mathematical faculty at the University of Bonn he sent a habilitation document. The faculty approved his plan but it failed because of the Berlin government for reasons unconnected with the subject. A later attempt to receive a lectureship at the technical University of Braunschweig also failed. From 1893 to 1911 he was working as a high school professor at Trier until his retirement. Until his death in 1921 he was actively engaged in the fields of mathematics, physics and natural philosophy. He corresponded with well-known mathematicians and physicists, such as Hermann von Helmholtz, Heinrich Hertz, Felix Klein and Philipp Lenard. Because of his unusual scientific creativity and versatility the philosophical faculty of the University of Bonn honoured him demonstratively on the occasion of his golden doctor anniversary with the renewal of his doctor dignity on July 31, 1916. Caspar Isenkrahe died after serious physical sufferings on August 12, 1921. His legacy is kept safe in Trier (to be more precise partly in the town archives and partly in the diocese archives). The partial papers I (size: 0.5 meters) in the town archives of Trier includes correspondences, poems, clay creations, manuscripts as well as different collections from the cultural life around the time of the turn of 19th to the 20th century. The partial papers II (size: 2.50 meters) in the diocese archives includes personal documents, works, a biography as well as additional correspondence. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Caspar Isenkrahe」の詳細全文を読む スポンサード リンク
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