Jan Cornelis Kluyver

Dutch mathematician who made important contributions to analysis, number theory and geometry. He was the son of the merchant Albert Kluijver (17 Febr 1831, Koog aan de Zaan - 16 December 1893 - Koog aan de Zaan) en Neeltje Dekker (25 January 1831, Wormerveer - 5 Augustus 1909, Leiden) who married 25 May 1854 at Wormerveer and got 5 children. His brother Albert Kluijver (4 December 1858, Leiden - 14 February 1938) would become professor of Dutch Letters in Groningen. He followed the HBS at Zaandam and studied at the Polytechnische School of Delft to become a civil engineer in 1881. He did some work as an engineer, later as a mathematics teacher at HBS schools in Breda and Amsterdam. From 28 June 1892 to 15 September 1930 he was professor at Leiden University. At that time it was "Wis- en Natuurkunde", later the disciplines separated. .He succeeded David Bierens de Haan (3 May 1822, A 'dam - 12 Augustus 1895, Leiden). His inaugural speech was held 28 September 1892: Beschouwingen over de nieuwere algebra. His most influential doctoral students were Johannes Gaultherus van der Corput (Ph.D 1919) and Hendrik Douwe Kloosterman (Ph. D 1924). In 1896 he got a degree honoris causa at Groningen, in 1887 he became member of the academy of science. He is known for the Kluyver's Formula for Ramanujan's Sum and the Franel-Kluyver Integral. He died 31 December 1932 (22/4) at Leiden, cause unknown, exactly four years (Notice the Pythagorean saying: Four is all) after the death of his spouse on 31 December 1928 (27/9). Personal On 27 December 1883 he married Marie Honigh in Koog aan de Zaan. She died 31 December 1928 in Leiden. They got a son Albert Jan born 3 June 1888 and a daughter Marie Johanna Kluijver, born 17 June 1894 at Leiden. Albert Jan Kluijver changed his birth name Kluijver in Kluyver on 12-9-1941 via the court of Breda. His father is also called Kluyver in online resources, though it should probably be Kluijver.