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József Kürschák
József Kürschák (14 March 1864 – 26 March 1933) was a Hungarian mathematician noted for his work on trigonometry and for his creation of the theory of valuations.〔http://www.omikk.bme.hu/archivum/angol/htm/kurschak_j.htm〕 He proved that every valued field can be embedded into a complete valued field which is algebraically closed. In 1918 he proved that the sum of reciprocals of consecutive natural numbers is never an integer. Extending Hilbert's argument, he proved that everything that can be constructed using a ruler and a compass, can be constructed by using a ruler and the ability of copying a fixed segment. He was elected a member of the Hungarian Academy of Sciences in 1897.
==References==
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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