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Weierstrass : ウィキペディア英語版
Karl Weierstrass

Karl Theodor Wilhelm Weierstrass (; 31 October 1815 – 19 February 1897) was a German mathematician often cited as the "father of modern analysis". Despite leaving university without a degree, he studied mathematics and trained as a teacher, eventually teaching mathematics, physics, botany and gymnastics.
Weierstrass formalized the definition of the continuity of a function, and used it and the concept of uniform convergence to prove the Bolzano–Weierstrass theorem and Heine–Borel theorem.
== Biography ==
Weierstrass was born in Ostenfelde, part of Ennigerloh, Province of Westphalia.
Weierstrass was the son of Wilhelm Weierstrass, a government official, and Theodora Vonderforst. His interest in mathematics began while he was a ''Gymnasium'' student at Theodorianum in Paderborn. He was sent to the University of Bonn upon graduation to prepare for a government position. Because his studies were to be in the fields of law, economics, and finance, he was immediately in conflict with his hopes to study mathematics. He resolved the conflict by paying little heed to his planned course of study, but continued private study in mathematics. The outcome was to leave the university without a degree. After that he studied mathematics at the University of Münster (which was even at this time very famous for mathematics) and his father was able to obtain a place for him in a teacher training school in Münster. Later he was certified as a teacher in that city. During this period of study, Weierstrass attended the lectures of Christoph Gudermann and became interested in elliptic functions.
In 1843 he taught in Deutsch-Krone in Westprussia and since 1848 he taught at the Lyceum Hosianum in Braunsberg. Besides mathematics he also taught physics, botanics and gymnastics.〔
Weierstrass may have had an illegitimate child named Franz with the widow of his friend Carl Wilhelm Borchardt.
After 1850 Weierstrass suffered from a long period of illness, but was able to publish papers that brought him fame and distinction. In 1856 he took a chair at the Gewerbeinstitut, which later became the Technical University of Berlin. In 1864 he became professor at the Friedrich-Wilhelms-Universität Berlin, which later became the Humboldt Universität zu Berlin. He was immobile for the last three years of his life, and died in Berlin from pneumonia.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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