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Valentina Borok

Born in Kharkov, Ukraine, valentina Borok has been a renown mathematician known for her research and contribution on the partial differentiation equation. in her second undergraduate year, Valentina began her research with her future husband, Yakov Zhitomirskii. Although her research with Yakov was under supervision by Georgii Shilov, the mathematics department supervisor of Kiev University, her undergraduate thesis on distribution theory and the applications to the theory of systems of linear partial differential equations was found to be extraordinary and was published in a top Russian journal. Later in 1954 she graduated from Kiev University and went on to graduate in Moscow State University. The thesis and research of Valentina Borok about the distribution theory and its application was selected to be published in one of the first volumes of American Mathematical Society in the year 1957; the same year she received her PhD for her research On the systems of Linear Partial Differential Equations with Constant Coefficients.

The information about the system of Linear Partial Differential equations with constant coefficient was publicized in the annals of mathematics.

She later published more papers from 1954 to 1959, which contained a range of inverse theorems that allowed partial differential equations to be characterized by certain properties of their solutions. " In the same period she obtained formulae that made it possible to compute in simple algebraic terms the numerical parameters that determine classes of uniqueness and well-posedness of the Cauchy problem for systems of linear partial differential equations with constant coefficients"

"In the early 1960s Valentina worked on fundamental solutions and stability for partial differential equations well-posed in the sense of Petrovskii. Her two other lines of work in that period were on the parabolic systems degenerating at infinity and on the dependence of classes of uniqueness on the transformations of the spatial argument. Her results in both of these directions are still quite influential some 40 years later. Valentina's work during that time was mostly joint with Yakov Zhitomirskii."

<ref>http://www-history.mcs.st-and.ac.uk/Biographies/Borok.html<ref> <ref>http://www.jstor.org.queens.ezproxy.cuny.edu:2048/stable/1969243?seq=1&uid=3739832&uid=2134&uid=2&uid=70&uid=4&uid=3739256&sid=21103915980043<ref> <ref>http://www.ams.org.queens.ezproxy.cuny.edu:2048/mathscinet/search/publications.html?pg1=IID&s1=217562<ref>