Person: Sokolov, Yurii Dmitrievich
Yurii Dmitrievich Sokolov was a Russian mathematician who worked on the nbody problem.
Mathematical Profile (Excerpt):
 He supervised Sokolov's research in the area of mechanics of particles and this was the topic of his doctorate which in many ways followed on from Grave's Master's thesis.
 Sokolov's first publication appeared in 1923.
 From 1934 Sokolov taught at the Institute of Mathematics at the Academy of Sciences of Ukraine.
 Sokolov's main work was on the nnnbody problem, which he worked on for nearly 50 years and he summarised his contributions in the book Singular trajectories of a system of free material points (Russian) which was published in 1951.
 Sokolov also published on celestial mechanics and hydromechanics.
 One of the topics which will always be associated with Sokolov's name is his method for finding approximate solutions to differential and integral equations.
 The method which he introduced is now sometimes called 'the averaging method with functional corrections' or sometimes called 'the Sokolov method'.
 E L Albasiny, reviewing Sokolov's textbook, first formally describes the approximations from averaging of functional corrections.
 The first part of Sokolov's book discusses applications of his method to problems which can be modelled by linear integral equations with constant limits.
 In the final part Sokolov examines applications of his method to integral equations of mixed type, then in a number of appendices he presents some generalisations of the method.
 Sokolov died only a few months before his 75th birthday and only a few months short of completing 50 years of scientific work in the Ukrainian Academy of Sciences.
Born 26 May 1896, Labinskaya Stanitsa (now Labinsk), Russia. Died 2 February 1971, Kiev, Ukranian SSR (now Kyiv, Ukraine).
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Origin Russia
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References
Adapted from other CC BYSA 4.0 Sources:
 Oâ€™Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive