Felice Casorati

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Born: 17 Dec 1835 in Pavia, Italy
Died: 11 Sept 1890 in Casteggio, Italy

 

Felice Casorati was a student at Pavia and later taught at Pavia and Milan. In 1858, together with Betti and Brioschi, he visited Göttingen, Berlin and Paris and this visit is often taken as the point where Italian mathematics joined the mainstream of European mathematics.

Casorati is best remembered for the Casorati-Weierstrass theorem which says that in any neighbourhood of an essential singularity of a function it comes arbitrarily close to any given value. Weierstrass proved this in a paper of 1876 but Casorati had already included it in his 1868 treatise on complex numbers.