Born: 5 Feb (24 Jan. Julian style)
1842 in Warsaw, Poland

Died: 14 Dec 1927 in Leningrad,
USSR (now St Petersburg, Russia)

**Vice-President of the St. Petersburg Mathematical Society (1890--1892),
President (1892--190?).**

See a Russian article from the Brokhaus & Efron Dictionary

He received a doctorate from St Petersburg in 1873. His doctoral dissertation
*On
definite integrals and functions with application in expansion of series*
was an early investigation of the theory of singular integral equations.
It investigated in detail Cauchy-type integrals which played an important
role in boundary value problems in the theory of functions of a complex
variable.

Sokhotsky became a professor at the University of St Petersburg in 1883. Influenced by Chebyshev, he studied special functions, in particular Jacobi polynomials and Lamé functions. His work is important in the development of the theory of functions, in particular having applications in the theory of hypergeometric series and differential equations.

Other topics Sokhotsky studied included Zolotarev's theory of divisibility of algebraic numbers.

Article by: *J.J. O'Connor and E.F. Robertson*

Source: MacTutor History of Mathematics archive