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Karl Zsigmondy (Hungarian pronunciation: [ˈʒiɡmondi]) was an Austrian mathematician of Hungarian ethnicity. He was a son of Adolf Zsigmondy from Pozsony, Kingdom of Hungary (now Bratislava, Slovakia) and his mother was Irma von Szakmáry of Martonvásár, Kingdom of Hungary.

He studied (1886–1890) and worked (1894–1925) at the University of Vienna. After his phd, in 1890, he studied at the University of Berlin, University of Göttingen and at the Sorbonne in Paris, but came back to Vienna in 1894. He discovered Zsigmondy's theorem in 1882.

He was the brother of the Nobel Laureate Chemist Richard Adolf Zsigmondy.

Zsigmondy's theorem

References

K. Zsigmondy (1892). "Zur Theorie der Potenzreste". Journal Monatshefte für Mathematik 3 (1): 265–284. doi:10.1007/BF01692444.
Th. Schmid (1927). "Karl Zsigmondy". Jahresbericht der Deutschen Mathematiker-Vereinigung 36: 167–168.