Person: Gershgorin, Semyon Aranovich
Semyon Gershgorin was a Belarussian mathematician who produced important results in numerical approximation.
Mathematical Profile (Excerpt):
 The main features of Gershgorin's individuality are the innovative way he approached a problem, combined with power and clarity of analysis.
 In Gershgorin's 1926 paper 'On mechanisms for the construction of functions of a complex variable', he described linkage mechanisms implementing the complex arithmetic operations of addition, subtraction, multiplication and division.
 Gershgorin proposed that linkage mechanisms be constructed for various standard functions, which could then be assembled into larger mechanisms for more complicated functions.
 In 1929 Gershgorin published On electrical nets for approximate solution of the differential equation of Laplace (Russian) in which he gave a method for finding approximate solutions to partial differential equations by constructing a model based on networks of electrical components.
 The beauty and simplicity of Gershgorin's Theorem has undoubtedly inspired further research in this area, resulting in hundreds of papers in which the name "Gershgorin" appears.
 Semyon Aranovich Gershgorin's death is a great and irreplaceable loss to Soviet Science.
 Gershgorin's final paper On the conformal map of a simply connected domain onto a circle (Russian) was published in 1933 after his death.
 Independently of Lichtenstein, Gershgorin utilised Nystrom's method and reduced that conformal transformation problem to the same Fredholm integral equation.
 Later, A M Banin solved the LichtensteinGershgorin integral equation approximately, by reducing it to a finite system of linear differential equations.
Born 24 August 1901, Pruzhany, Russian Empire (now Belarus). Died 30 May 1933, Leningrad, USSR (now St Petersburg, Russia).
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Origin Belarus
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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