Ferdinand Rudio

Ferdinand Rudio (born 2 August 1856 in Wiesbaden, died 21 June 1929 in Zurich) was a German and Swiss mathematician and historian of mathematics.

Rudio's father and maternal grandfather were both public officials in the independent Duchy of Nassau, which was annexed by Prussia when Rudio was 10. He was educated at the local gymnasium and Realgymnasium in Wiesbaden, and then in 1874 began studying at ETH Zurich, then known as the Eidgenössische Polytechnikum Zürich. His initial courses in Zurich were in civil engineering, but in his second year (under the influence of Karl Geiser) he switched to mathematics and physics. Finishing at Zurich in 1877, he went on to graduate studies at the University of Berlin from 1877 to 1880, earning his Ph.D. under the joint supervision of Ernst Kummer and Karl Weierstrass. Next, Rudio returned to ETH Zurich, earning his habilitation in 1881 and becoming at that time a privatdozent. He became an extraordinary professor at Zurich in 1885, and a full professor in 1889.

Rudio was one of the organizers of the first International Congress of Mathematicians in 1897. He served as General Secretary of the congress, and as editor of the proceedings of the congress. He was the editor of the quarterly journal of the Zürich Natural Sciences Society from 1893 until 1912, and was also president of the society.

In 1919, the University of Zurich gave Rudio an honorary doctorate. By 1928, he was in poor health, and retired from his position at Zurich. He died a year later.

Rudio's research ranged over group theory, abstract algebra, and geometry. His thesis research concerned the use of differential equations to characterize surface by the properties of their sets of centers of curvature, and he was also known for the first proof of convergence of Viète's infinite product for π. He also authored the textbook Die Elemente Der Analytischen Geometrie, in analytic geometry, published in 1908.

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